Some owners are duplexing their old houses for extra income.
为得到额外的收益，有些房产主正在双倍扩建其旧房。
The reason is simple: in return for shouldering extra risk, investors require a bigger income.
原因很简单：作为承担额外风险的回报，投资者们要求更高的收入。
I work there one night a week for the extra income.
我在那儿一周工作一个晚上赚外快。
He earned a lot of extra income for himself by taking classes on the side.
同时，通过开课讲学，他还会有额外的收入。
He earned a lot of extra income for himself by taking classes on the side.
同时，通过开课讲学，他还会有额外的收入。
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