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。
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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