When you stomp on it the sand feels hard, but if you gently press your feet onto it the sand gradually gives way and your feet sink and disappear.

• 在沙子面跺脚时,您会感觉沙子很坚硬,但如果用脚轻轻地踩在上面,沙子会逐渐塌陷,脚会沉没在沙子之中。