例句:They make living by collecting garbage, stealing, begging, and singing in the street.

他们以捡垃圾、偷东西、要饭、卖唱为生。 

2.paying for 支付；偿还

例句:I am paying for the house by monthly instalments.

我按月分期偿还购买房子的款项。

3.pop into 匆忙走

例句:I'll just pop into the chemist for some razor blades.

我这就去杂货店买些刀片。

4.for example 例如

例句:Great men have often risen from poverty--Lincoln and Edison, for example.

大人物常常出身贫寒，例如林肯和爱迪生。