Also note that the else statements are needed, since a call to Free will make the next check to the same component index an invalid check.

还要注意的是，else语句是必需的，因为调用Free会使下次对同一组件索引的检验变成无效检验。

youdao

When you publish it to outside clients, you want to check the arguments and throw an exception if the arguments are invalid.

当你将它向外界的客户公布时，你要检查实参并且如果实参无效，你要给出一个例外。

youdao

Include a field with the current UTC time-stamp in it and check it on the server. If it is too far in the past, or if it is in the future, the form is invalid.

包含一个存储当前UTC时间戳的字段，并在服务端检查它，如果它是太遥远的过去，或者是将来，那么这个form是无效的。

youdao