Before you can open the box, you must sign a slip of paper.

你在开箱之前，必须在纸上签名。

youdao

If nobody's at home just slip the key through the letter box.

如果没有人在家，那就将钥匙放进信箱。

youdao

If nobody's at home just slip the key through the letter box.

如果没有人在家，那就将钥匙放进信箱。

youdao