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It found that infants had an average of 14 alloparents a day by the time they were 18 weeks old, and were passed between caregivers eight times an hour.
研究发现，婴儿长到18周大时，平均每天有14位异亲照料者，且每小时要在照料者之间传递八次。
According to the Brookings Institution, a short list of eight American cities that included San Francisco, San Jose, Boston, and Seattle had roughly 38% of all tech jobs by 2019.
据布鲁金斯学会称，截至2019年，包括旧金山、圣何塞、波士顿和西雅图在内的寥寥八座美国城市拥有大约38%的科技工作岗位。
About eight million square metres of plastic grass is sold each year but opposition has now spread to the highest gardening circles.
每年约有800万平方米的塑料草坪售出，但反对之声现已蔓延到最高层的园艺界。
In one study, participants completed a battery of eight tasks, including four that tapped reflective thinking (discerning rules, comprehending vocabulary) and four that tapped intuition and creativity (generating new products or figures of speech).
在一项研究中，参与者完成了一组共八项任务，其中四项调用反思性思维（辨别规则、理解词汇），四项调用直觉和创造力（构想新产品或修辞手法）。
They housed eight adult rats with two types of robotic rat — one social and one asocial — for four days.
他们把八只成年鼠与两种机器鼠——一种善于社交，一种不善社交——饲养在一起，为期四天。
Eight monumental curving staircases of granite with over 4,000 individually cast bronze balusters are capped by four skylight domes and two stained glass rotundas.
八座宏伟的花岗岩弧形楼梯配有4000多根单独铸造的青铜栏杆，其上方是四个天窗穹顶和两个彩色玻璃圆形大厅。
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The cost of solar panels has dropped by 80 percent and the cost of wind turbines by close to one-third in the past eight years.
在过去八年里，太阳能电池板的成本下降了80%，风力涡轮机的成本下降了近三分之一。
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There was first the rate of growth: (48) in many countries of Western Europe, the numbers of students in higher education doubled within five-year periods during the 1960s and doubled again in seven, eight, or 10 years by the middle of the 1970s.
首先是增长速度：(48) 在许多西欧国家，20世纪60年代高等教育的学生人数在五年内翻了一番，到70年代中期又在七年、八年或十年内再次翻番。