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 spoiling children with material things does little to reduce parental guilt (since parents never feel they've given enough),
    但是, 用物质的东西来宠爱孩子几乎不能减轻父母的内疚感（因为父母从不会感到他们给孩子的东西已经够了),

3. We are faced with a shortage in manpower , not in raw material.
    我们面临的问题是缺乏人力而不是缺乏原料。

4. We must trace the source of these noxious gases before they asphyxiate us.
    在我们被这些有毒气体窒息之前, 必须查出其来源。

5. Where is the source of the Thames?
    泰晤士河源出何处？

6. Whatever the source of noise, one thing is certain: silence, it seems, has become a golden memory.
    不管噪声来自何方，有一点是肯定的：看来寂静已变成一种珍贵的回忆。

7. We like them in the same way that we like pretty curtain material.
    我们喜爱它们就像我们喜欢漂亮的窗帘布一样。

8. Water is the source of this beauty and the source of life on Earth.
    水是地球上的美丽之源、生命之源。

9. Women of child-bearing age are at greatest risk, since their monthly bleeding is a major source of iron loss.
    育龄女性危险最大，因为月经是铁流失的重要原因之一。

10. They are not anxious social climbers, and they have no devotion to material things.
    他们不是急切地向上爬的人, 他们不热衷于物质享受.