它们被运动检测器触发或是由商店服务员或是房主按按钮触发。
These are triggered by motion detectors or the press of a button by a shop assistant or householder.
当我拿着这两袋免费的沙拉离开商店时，我对商店服务员的诚实感到惊异。
When I left the store with the two bags of free salad, I marveled at18 the honesty of the store clerk.
很多毕业生就业无门，只能当商店服务员或在工厂流水线上工作，这不是因为没有可供选择的白领工作，而是因为他们不能胜任任何现有的职位。
Many grads are underemployed, working as shop attendants or on factory lines, and not because there aren't white-collar jobs open but because they aren't qualified for any available positions.
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