interest多指利率（利息）
return多指回报（投资收益
Return is also used as an abbreviation for income tax return， see 1040 Form.
另外Return回报率一种证券在特定期间的收入或损失，包括收入加资本收益。一般以百分比表达。
I call it a whimsical idea because I'd never have been able to enjoy the financial return.
我把它称为一个异想天开想法，因为我不可能得到经济回报。
