作为所得理论结果的某些应用，文中还研究了极大化问题与微分方程组的非零周期解等问题。

For the application of some general theories obtained in the paper, the problems on the maximization and the non-zero periodic solutions for a system of differential equations are also studied.

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我甚至还有零花钱呢！一周25美分。

I even got an allowance: 25 cents a week.

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一周接一周地，她把零用钱攒起来买了这只毛绒狗。

Week after week, she had saved her allowance to buy the toy dog.

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