quicksand

n. 流沙, 流沙区, 危险状态

quick.sand

n.（名词）
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：一种由松散的沙子和水混合成的沙层，形成一堆松软、移动的物质，在压力下很容易塌陷，并可吞没置留在沙面上的任何物质
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：一种可快速轻易进入的地方或形势，但从中脱身可能很困难或不可能的：
例句：
.This theory of the future entrapped[them] in the quicksands of Vietnam. (Arthur M. Schlesinger, Jr.)
.这一关于未来的理论使［他们］ 掉进了越南这个泥潭之中. (小阿瑟M.施莱辛格)