You two can share your reference books so that you don't both have to buy them.
你们两个人的参考书可以串换着看,省得都去买了.
A stitch in time saes nine.
及时缝一针,省得日后缝九针(防微杜渐).
The house should be renovated all at once to save troubles afterwards.
装修就该一步到位,省得以后麻烦.
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