n.采沙坑
The children were playing in the sandpit.
孩子们在沙坑里玩耍.
Hey! The children are playing in the sandpit at the river side.
喂! 孩子们在河边的沙坑里玩耍呢!
There was a sandpit, a seesaw and a swing in the playground.
游乐场上有一处沙坑、一块跷跷板和一个秋千架。