如果不能验证数字签名，则运行时退出并给出错误信息。
If the digital signature cannot be verified, the runtime exits with an error.
通常，这只能在使用者输入数据后通过加以验证的方式来实现。如果数据无效，则弹出错误信息。
Typically, this is done by evaluating a user's entry after she has finished entering it, and throwing up an error message if it is invalid.
通常，这只能在使用者输入数据后通过加以验证的方式来实现。如果数据无效，则弹出错误信息。
Typically, this is done by evaluating a user's entry after she has finished entering it, and throwing up an error message if it is invalid.
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