This is a delicate point: find a proof that an UFO visited us.
由此争论的症结便出来了：找到一个UFO造访我们的证据。
How often are there problems with proof of delivery documentation at the delivery point?
在发货点交货证明文件发生问题的频率？
Proof is the key point to achieve printing workflow digitalization.
打样是对实观印刷流程数码化至关重要的一步。
Proof is the key point to achieve printing workflow digitalization.
打样是对实观印刷流程数码化至关重要的一步。
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