quicksand

詳細解釋：

quick.sand

n.（名詞）
A bed of loose sand mixed with water forming a soft, shifting mass that yields easily to pressure and tends to engulf any object resting on its surface.
流沙：一種由鬆散的沙子和水混合成的沙層，形成一堆鬆軟、移動的物質，在壓力下很容易塌陷，並可吞沒置留在沙面上的任何物質
Often quicksands A place or situation into which entry can be swift and sudden but from which extrication can be difficult or impossible:
常作 quicksands 陷阱：一種可快速輕易進入的地方或形勢，但從中脫身可能很困難或不可能的：
例句：
.This theory of the future entrapped[them] in the quicksands of Vietnam. (Arthur M. Schlesinger, Jr.)
.這一關於未來的理論使［他們］ 掉進了越南這個泥潭之中. (小阿瑟M.施萊辛格)