Students should not worry about when exactly to use certain expressions.
学生不必担心什么时候使用某些特定的表达。
Certain expressions - such as in - apply to a variable number of expressions.
某些表达式(比如in)可以应用到多个表达式。
Further, the effect of certain expressions is undefined. For example, consider the following code.
进一步讲，某些表达式的效果是未定义的。例如，考虑下面的代码。
Do not use expressions that are known only to people coming from a certain background.
请不要用那些只有某个特定背景的人才能听懂的词语。
You can make certain faces come to life by giving them different expressions, e. g., happiness, anger.
你可以通过给脸谱画上不同的表情使脸谱显得逼真，有生气，例如高兴、生气。
You can make certain faces come to life by giving them different expressions, e. g., happiness, anger.
你可以通过给脸谱画上不同的表情使脸谱显得逼真，有生气，例如高兴、生气。
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