As basic rules of a language must be practiced continually, and therefore are never fixed, so exercises toward distinct color effects never are done or over. New and different cases will be discovered time and again.
由于语言的基本规则必须不断地练习,因此永远不会固定,所以针对不同颜色效果的练习永远不会结束。新的和不同的病例将被发现一次又一次。
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