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

That means the current total of about 50 army combat brigades and marine equivalents in the full-time forces should support about 17 in the field.

这意味着现在总共50个作战旅和等量的全职陆战队应该支撑战区的17个旅。

youdao

Field emission stability and life time of CNT cathode is closely related with the vacuum level, thermal effects during the emission and the current transport capability.

影响碳纳米管阴极场发射稳定性和寿命的主要因素有真空度、场发射过程中的热效应以及场发射体对场发射电流的承载能力等。

youdao

This time around, most people see the current field of Republican hopefuls as a noisy blur, an only-in-America phenomenon -- or a "matsuri, " as one woman described it, in reference to Japan's colorful, oft-chaotic outdoor festivals.

CNN: Can Tokyo learn from the American political 'matsuri'?

Perhaps this means earning a paycheck at your current job while doing a part-time internship in your new field.

FORBES: Connect