quicksand

n.

流沙，敏捷，危险而捉摸不定的事物；悬浮体；流砂；

复数：quicksands

1. A mule won't sink in quicksand but a donkey will.
   骡子不会陷入流沙中,但是驴子会。
2. Is it true that a man who steps into quicksand is doomed to die?
   掉入流沙中的人就注定会死去吗？
3. Yet it has a way of slipping through your fingers like quicksand.
   可是它会像流沙一样从缝间溜走。
4. Vanity is the quicksand of reason.
   虚荣乃理学之流沙。
5. Conceit is the quicksand of success.
   自负是成功的流沙。

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