他穿着一件深色夹克，下面是一件红色衬衫。

He was wearing a dark jacket with a red shirt ___underneath.

这块岩石大约70米高，下面有水。

The rock was about 70m high and there was water ___underneath.

她把钥匙藏在地垫下面。

She hid the key ___underneath the mat.