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。