If neighbors are strangers to one another, they are less likely to sweep the sidewalk of an elderly couple living next door or keep an eye out for young trouble makers.
如果邻居彼此都是陌生人，他们就不太可能打扫住在隔壁的老年夫妇门前的人行道，也不太可能留意到一些捣乱的年轻人。
Particularly with older systems, though, keep an eye and an ear out for hardware trouble.
较旧的系统尤为如此，因此应该随时注意硬件故障。
If you're having trouble with your vision, your parent can take you for an eye exam.
如果你有关于视力上的问题，你的父母应该带你去做视力检测。
If you're having trouble with your vision, your parent can take you for an eye exam.
如果你有关于视力上的问题，你的父母应该带你去做视力检测。
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