plughole

The water went down the plughole with a loud gurgle.

水着汩汩声流下了排水洞。

plug the other end of the connection cable into the plughole in the front of the charger;

将连接线另一端插入充电器头部插孔中；

Then, after a few fruitless minutes searching for the plughole, you discover that to drain the water away, the entire devicetips rotates around until its disk is tipping gently forwards.

再转过来，你看到那个凹了吧，躺进去放上水，你就可以洗一个泡泡浴了。