浮力，不下陷能力尤指车辆的轮胎表层使轮胎保持不陷入柔软表面如沙地、湿地或雪地的能力 The capability, especially of a vehicle tread or tire, to remain on top of a soft surface, such as sand, wet ground, or snow.
最后她终于想到了写字，用一只蹄子把她的名字－－很短的一个名字－－划在沙地上。 At length she bethought herself of writing, and inscribed her name-it was a short one-with her hoof on the sand.
他们顶着风暴艰难地通过了沙地。 The ploughed through the sands in spite of the storm.
小河在沙地上冲出了一条沟。 The stream had washed (out) a channel in the sand.
