Unless a check is signed, it is invalid.
支票除非签了名，否则是无效的。
Unless a check is signed, it is invalid.
护照过期是无效的。
The Directory Service cannot process the script because it is invalid.
脚本无效，目录服务无法分解此脚本。
The second method is insufficient because it is still possible to enter an invalid value.
只第二种方法是不够的，因为只用这种方法仍然可能输入无效的值。
The evidence is invalid in that it was obtained through illegal means.
此证据无效，因为它通过非法手段获得的。
The maximum application version is invalid. It must be smaller than minimum version.
应用程序最高版本无效。最高版本小于最低版本。
The maximum version is invalid. It must be smaller than minimum version.
最高版本无效。最高版本小于最低版本。
I think the proposition is invalid, and today I will try to refute it.
我觉得这个提法有问题，今日试驳议之。
This ticket has passed its expiration date, and so it is now invalid.
这张票已过了有效期，现在作废了。
This ticket has passed its expiration date, and so it is now invalid.
这张票已过了有效期，现在作废了。
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