If you only learn the grammar rules by heart and dont do enough exercises, it is certain that you cant understand them perfectly.

如果你仅仅牢记语法规则而不做足够的练习，你肯定不能充分理解它们。

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If we only learn the grammatical rules by heart and don't do enough exercises, it is certain that we can't understand them perfectly.

如果我们只学习语法规则和没有做足够的练习，可以肯定的是，我们无法完全了解它们。

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They have a balanced and healthy diet, do physical exercises regularly, get enough sleep, and work with high efficiency.

他们注重饮食均衡和健康、定期锻炼，保证充足的睡眠，而且能够保证很高的工作效率。

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