These two principles, especially when used together, can be powerful motivators.

这两个原则，特别是当用在一起的时候会成为十分有力的激励因素。

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Used when a couple has decided to live together.

用于当一对恋人决定生活在一起时。

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We used to do homework together on weekends when my mom wasn't at home.

以前周末我妈妈不在家，我们就经常一起写作业。

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We used to do homework together on weekends when my mom wasn't at home.

以前周末我妈妈不在家，我们就经常一起写作业。

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