1. Even if a piped water supply is safe at its source, it is not always safe by the time it reaches the tap.
    即使管道供水系统在水源处安全的，等水到达龙头时就不一定总是安全的了。

2. But instruments far more delicate than that were needed if any really serious advance was to be made.
    但是，如果要取得真正重大的进展，需要有比这种装置精细得多的仪器。

3. Both the police and the workmen were grateful to the student for this piece of advance information.
    警察与工人都对那个学生事先通报情况表示感谢。

4. With the invention of writing, a great advance was made, for knowledge could then be not only communicated but also stored.
    随着书写的发明，又迈进了一大步，因为这样一来，知识不仅能交流，而且能储存了。

5. When Canada took similar measures to protect the supply of herring in the 1970s, the fish eventually recovered.
    加拿大在20世纪70年代也曾采过取类似措施来保护鲱鱼的数量，最终鲱鱼的数量得到了恢复。

6. While natural gas use increases, use of coal as fuel is decreasing.
    随着天然气利用量的增长，煤炭作为燃料的使用量正在减少。

7. Working in an art-supply shop, "I met working artists and realized you can make a living doing this."
    在一家艺术用品商店工作时，"我遇到了一些工作着的艺术家，并意识到这样做也能谋生。"

8. While meters don't always show the true fare (dishonest drivers sometimes adjust them to advance faster), it is seldom cheaper to rely on the driver to quote a fare.
    虽然计程器不会总是显示正确的车费，（有时司机不诚实，会改装计程器让它们跑得更快，）但你也别指望司机的报价会更便宜。

9. The car consumes a lot of fuel.
    这辆汽车很费汽油.

10. They are planning to divert the river to supply water somewhere else.
    他们正计划着使这河流转向，以便别处能得到水的供给。

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