If $userchoice is false (see Table 1), then Perl checks the value of $systemchoice and so on until it gets to the last value, which is always used, whether it's true or not.
如果 $userchoice 为假（请参阅表1），那么Perl就需要检查 $systemchoice的值，依此类推，直到最后一个值，这个值通常都会被使用，不管它是真还是假。
This routine checks some of the fields in the form and collates the errors, and prevents the form from being submitted by returning false.
这个例程检查表单中的一些域并整理错误，还通过返回false防止表单被提交。
By default, when a validator returns false, the remaining validation checks are aborted, but that parameter is also configurable for each individual validator.
默认情况下，如果一个验证器返回false，则剩余的验证检查都将取消，但这个参数也可以对单个验证器进行配置。
This routine checks some of the fields in the form and collates the errors, and also prevents the form from being submitted by returning "false".
这个例程检查表单中的一些域并整理错误，还通过返回“false”防止表单被提交。
Note that XMLEXISTS truly checks for the existence of a value and evaluates to true if a value exists, even if that value happens to be the Boolean value "false".
注意，XMLEXISTS只是检查一个值的存在，如果存在一个值，即使这个值碰巧为boolean值“false”，XMLEXISTS也将返回true。
Since XMLEXISTS truly checks for the existence of a value, even the existence of the value "false" satisfies XMLEXISTS so that any document qualifies for the result set.
由于XMLEXISTS实际上是检查值的存在，甚至“false”值的存在也将满足XMLEXISTS，因此任何文档都可以成为结果集。
Since XMLEXISTS truly checks for the existence of a value, even the existence of the value "false" satisfies XMLEXISTS so that any document qualifies for the result set.
由于XMLEXISTS实际上是检查值的存在，甚至“false”值的存在也将满足XMLEXISTS，因此任何文档都可以成为结果集。
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