n.流沙,敏捷,危险而捉摸不定的事物,悬浮体,流砂
The sandbank was uncertain, like quicksand under his feet.
那个沙坝并不稳固,他脚下如同踩着流沙一般。
I was about to sink into the quicksand of sin.
我就要陷入罪孽的深渊了。
The research seemed founded on quicksand.
这项研究犹如建在流沙之上,基础极不稳固。