对于三岁的孩子来说，由于一些原因，他们的成绩并没有得到改善，只是因为改变而略有下降。

For three-year-olds, for reasons that are still in need of clarification, no improvement—rather a slight drop in performance resulted from the change.

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三是要改善合作环境。

Thirdly, improve the environment for cooperation.

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要期望视觉在接下来的两到三个月后改善。

Expect your vision to improve over the next two to three months.

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