Basically, the only valid check will be the one on the last page of the report.
基本上,唯一有效的检查将是报告最后一页上的一个。
If an unset variable can't produce a valid result, check for the variable and throw an InvalidArgumentException.
如果未设置的变量无法生成有效的结果,请检查变量并抛出InvalidArgumentException。
The query does not check if the input is valid.
查询语句不会检查输入是否有效。
And the last thing we do for any of our structures to check them and figure out are these valid or not valid, are these good Lewis structures is to check the formal charge.
而为了检验任何一个结构是否有效,看它们是不是好的路易斯结构,我们要做的最后一件事就是检查形式电荷。
But when you start writing programs, especially when we get to web-based stuff where you want -- to check the user's input -- is it valid, is it an email address, -- and all these different scenarios -- it's actually often useful to be able to just enumerate them or rattle them off using this switching construct instead.
但是当你看是写程序时,特别是当我们,使用基于网络的东西,你想要,检查用户的输入-,它是合法的吗?它是不是一个电子邮箱地址?,所有的这些场景-,实际上它常常是有用的,当你用枚举结构列举它们,或者用它来快速地来说出它们。
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