When speaking or writing, on the premise of not causing to misunderstand the meaning of a sentence, one should try to omit what can be omitted.
说话或行文时，在不影响意思理解的前提下，能省略的就应省略。
If you omit the argument and you are supplying arguments by name, you do not need to indicate the omitted argument either by name or by commas.
如果省略参数并按名称提供参数，则无需按名称或按逗号指示省略的参数。
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