The term is sometimes used to mean the depth reference.

这一术语有时也指深度参考点。

youdao

I sometimes used to wonder whether he stole my money.

我有时禁不住怀疑，莫非是他偷了我的钱。

youdao

I sometimes used to wonder whether he stole my money.

我有时禁不住怀疑，莫非是他偷了我的钱。

youdao