你应该在电池完全没电之前给它们充电。

You should ___recharge the batteries before they die completely.

当你在重要通话时手机需要充电，这很令人沮丧。

It's frustrating when your phone needs to be ___recharged during an important call.

现代智能手机可以使用无线充电器快速充电。

Modern smartphones can be quickly ___recharged using wireless chargers.