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Several American cities are mentioned to show ____
文中提到几座美国城市是为了说明____
If you look at the apps on your phone, chances are you have at least one related to your health — and probably several.
如果你看看手机上的应用程序，很可能至少有一个与你的健康有关——而且可能有好几个。
[As a result], these structures became important centers for cultural [exchange] and interaction, with travellers sharing their cultures, ideas and beliefs, [as well as] taking knowledge with them, greatly [influencing] the development of several civilisations.
因此，这些建筑成为文化交流与互动的重要中心，旅行者在此分享各自的文化、思想和信仰，并把知识带走，极大地影响了多个文明的发展。
Throughout the trip, Jackson juggled multiple cameras and plate sizes using the “collodion process” that required him to coat the plates with a chemical mixture, then expose them and develop the resulting images with a portable darkroom. The crude technique required educated guesses on exposure times, and involved heavy, awkward equipment — several men had to assist in its transportation. Despite these challenges, Jackson captured dozens of striking photos, ranging from majestic images like his now-famous snapshot of Old Faithful, to casual portraits of expedition members at the camp. While veterans of previous expeditions wrote at length about stunning trail sights, these vivid photographs were another thing entirely.
在整个旅途中，杰克逊使用“火棉胶工艺”同时摆弄多台相机和多种尺寸的底片，这种工艺要求他先给底片涂上一层化学混合物，然后曝光，再用便携式暗室冲洗出影像。这种简陋的技术需要凭经验推测曝光时间，而且所用设备笨重难使——需要好几个人协助搬运。尽管困难重重，杰克逊还是拍下了几十张引人注目的照片，从他那张如今已闻名于世的老忠实泉快照这样的壮丽画面，到营地里考察队员的随意肖像，不一而足。以往考察的老手们曾长篇累牍地描写沿途的壮丽景色，而这些生动的照片则完全是另一回事。
She is proud that several sculptures have even gone on display again, albeit sometimes beneath protective cases.
令她自豪的是，有几件雕塑甚至重新展出了，尽管有时是放在保护罩下面。
Fewer artists than scientists responded to the Nature poll; however, several respondents noted that artists do not simply assist scientists with their communication requirements.
回应《自然》调查的艺术家比科学家少；不过，有几位受访者指出，艺术家不只是协助科学家满足其传播需求。
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But among student subjects who discussed meat ethics, meal purchases containing meat decreased from 52 to 45 percent — and this effect held steady for the study’s duration of several weeks.
但在讨论过肉类伦理的学生受试者中，含肉餐食的购买比例从52%降到了45%——而且这一效果在为期数周的研究期间一直保持稳定。
During the 1840s and 1850s, in the early days of photography, exposure times were notoriously long: the daguerreotype photographic method (producing an image on a silvered copper plate) could take several minutes to complete, resulting in blurred images as sitters shifted position or adjusted their limbs.
在19世纪40年代和50年代，即摄影的早期，曝光时间之长是出了名的：银版照相法（在镀银铜板上成像）可能需要几分钟才能完成，拍摄对象一挪动位置或调整四肢，图像就会模糊。
At the same time, the European Union, Spain, Britain and several other countries have all seriously contemplated digital services taxes.
与此同时，欧盟、西班牙、英国和其他几个国家都在认真考虑征收数字服务税。
These pauses typically occur at about three per second, and the eyes then jump to another spot, until several important points in the image are registered like a series of snapshots.
这种停顿通常每秒发生约三次，然后眼睛跳到另一个点，直到图像中的几个重要点像一系列快照一样被记录下来。
American farmers have been complaining of labor shortages for several years.
美国农场主抱怨劳动力短缺已有好几年了。
The growth of the use of English as the world’s primary language for international communication has obviously been continuing for several decades.
英语作为世界主要国际交流语言，其使用范围的扩大显然已经持续了几十年。
They cite past research by several authors to show that this is the gap that must be narrowed to close the achievement gap.
他们引用了几位作者以往的研究，以表明要缩小成就差距，就必须缩小这方面的差距。
If you have no friends or relatives, try to participate in several online communities, full of people who are always willing to share advice and encouragement.
如果你没有朋友或亲人，可以试着加入一些网络社区，那里有很多总是乐于分享建议、给予鼓励的人。
The commission ignores that for several decades America’s colleges and universities have produced graduates who don’t know the content and character of liberal education and are thus deprived of its benefits.
该委员会忽视了这样一个事实：几十年来，美国高校培养出的毕业生并不了解博雅教育的内容和特质，因而也无法从中受益。
Though several fast-fashion companies have made efforts to curb their impact on labor and the environment — including H&M, with its green Conscious Collection line — Cline believes lasting change can only be effected by the customer.
尽管已有几家快时尚公司努力减少自身对劳工和环境的影响——包括推出绿色“环保自觉”系列的H&M——但克莱因认为，持久的改变只能由顾客来实现。
For example, Business Week predicted in 1975 that electronic means of payment would soon “revolutionize the very [concept] of money itself,” only to [reverse] itself several years later.
例如，《商业周刊》在1975年曾预言电子支付手段很快就会“彻底变革货币这一概念本身”，结果几年后却推翻了自己的说法。
Although electronic means of payment may be more efficient than a payments system based on paper, several factors work [against] the disappearance of the paper system.
尽管电子支付手段可能比基于纸质的支付系统更高效，但有几个因素阻碍着纸质系统的消失。
Third, the use of paper checks gives consumers several days of “float” — it takes several days [before] a check is cashed and funds are [withdrawn] from the issuer’s account, which means that the writer of the check can earn interest on the funds in the meantime.
第三，使用纸质支票能给消费者带来几天的“浮存期”——支票兑现、资金从开票人账户中划出之前需要几天时间，这意味着开票人在此期间可以赚取这笔资金的利息。
Third, the use of paper checks gives consumers several days of “float” — it takes several days [before] a check is cashed and funds are [withdrawn] from the issuer’s account, which means that the writer of the check can earn interest on the funds in the meantime.
第三，使用纸质支票能给消费者带来几天的“浮存期”——支票兑现、资金从开票人账户中划出之前需要几天时间，这意味着开票人在此期间可以赚取这笔资金的利息。
Yet, in several instances, justices acted in ways that [weakened] the court's reputation for being independent and impartial.
然而，在好几个事例中，大法官们的所作所为削弱了最高法院独立公正的声誉。
According to several studies concluding that parents are less happy than childless couples, single parents are the least happy of all.
几项研究得出结论，为人父母者不如无子女的夫妇幸福，而根据这些研究，单亲父母是所有人中最不幸福的。