说明
in the grass/on the grass
核心问题
（A）Don't walk on the grass.
(B) She was sitting in the grass.
请问 on the grass 与 in the grass 哪个用法是正确的？
词典解答
两个用法都是正确的。如果草是短的, 就可以把草地看成一个平面(面积), 那么使用介词 on 就是顺理成章的了。如果草是长的, 就可以把草地看成一个空间, 那使用介词 in 就是理所当然的了。
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We sat down on the dry grass with our backs on the wall. (Cronin) 我们背靠着墙坐在干草地上。
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Children in bright colored dresses played in the grass. (Sinclair) 穿着鲜艳服装的孩子们在草地里玩耍。