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。
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。
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.
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