grass復(fù)數(shù)形式

　　He lay back on the grass using his backpack as a pillow.

　　他用背袋當(dāng)枕頭仰臥在草地上。

　　The grass was wet with early morning dew.

　　清晨的露水使得青草濕漉漉的。

　　Humans cannot digest plants such as grass.

　　人不能消化草類(lèi)植物。

　　The dry grass caught fire.

　　干草著火了。

　　The runway is simply a strip of grass.

　　所謂跑道不過(guò)是一長(zhǎng)條草地而已。