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a. 看得见的，明显的，显著的4 次
What is more, they can be detected even when they are not actually visible.
而且，即使这些植物实际上看不见，它们的气味也能被察觉到。
These changes were gradual and at first scarcely visible.
这些变化是逐渐发生的，起初几乎察觉不到。
How do archaeologists know where to find what they are looking for when there is nothing visible on the surface of the ground? Typically, they survey and sample (make test excavations on) large areas of terrain to determine where excavation will yield useful information. Surveys and test samples have also become important for understanding the larger landscapes that contain archaeological sites.
当地面上什么也看不见时，考古学家怎么知道到哪里去找他们要找的东西呢？通常，他们会对大片地域进行勘测和取样（进行试掘），以确定在哪里发掘能获得有用的信息。勘测和试样对于了解包含考古遗址在内的更大范围的地貌也变得十分重要。
The same dramatic technological changes that have provided marketers with more (and more diverse) communications choices have also increased the risk that passionate consumers will voice their opinions in quicker, more visible, and much more damaging ways.
那些为营销者提供了更多（也更多样）传播选择的巨大技术变革，同样也增加了这样的风险：热情的消费者会以更快、更显眼、破坏性也大得多的方式发表意见。