He took off his sweater, rolled it into a pillow, and lay down on the grass.

他脱下毛衣，卷成一个枕头，然后在草地上躺了下来。

《柯林斯英汉双解大词典》

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

他用背袋当枕头仰卧在草地上。

《牛津词典》

The beds were covered by a grass mattress, two sheets, a cotton quilt and a pillow.

床上铺着一个草褥子，两条被单，一床棉被和一个枕头。

youdao