No gain is so certain as that which proceeds from the economical use of what you already have.

没有什么比从节约使用你已有的资源中获得的收益更确定无疑的了。

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I hope you love birds too. It is economical. It saves going to heaven.

我希望你也喜欢鸟。它是经济。这样就不用去天堂了。