1.because of 因为；由于

It is mainly because of my fault.
这主要是由于我的过错。

His business went under because of competition from the large corporations.
由于大公司的竞争，他的生意陷入了困境。

2.dwell on 详述；细想

A great number of water fowls dwell on the island.
许多水鸟在岛上栖息。

The majority of people do not live in the present. They either dwell on their past or daydream about the future.
大多数人都不能做到这一点，他们不是沉浸在过去的回忆中，就是整天幻想着自己的未来。

3.play with 同…一起玩；玩弄

Please play with me at playtime.
请在娱乐时间和我玩。

Go play with your friends.
去和你的朋友一起玩吧。