n. 铺在地上的防潮布

[ noun ]
a waterproofed piece of cloth spread on the ground (as under a tent) to protect from moisture
<noun.artifact>

groundsheet \ground"sheet`\ (ground"sh[=e]t`), n.
a piece of waterproofed cloth spread on the ground (as under
a tent) to protect the occupants from moisture.

Syn: ground cloth.
[WordNet 1.5]