m读音一样，都读/m/音。
My mouth felt completely dry.

我感到口干舌燥。

I clapped a hand over her mouth.

我猛地用一只手捂住了她的嘴。

She popped a mint into her mouth.

她往嘴里丢了块儿薄荷糖。

She kissed him full on the mouth.

她嘴正对嘴地吻了他。

How many widths can you swim?

你在游泳池里横向能游几个来回？

I managed to swim to safety.

我设法游到安全处。

I think I'll go for a swim.

我想去游泳。