postmark相关的词根或词缀是: mark post-

So they can 't trace the postmark .

别让他们从邮戳查到你。

The postmark was that of a city many miles distant .

邮戳标明寄自另一个遥远的城市。

Letter with a london postmark .

带有伦敦邮戳的信。

I see from the postmark that this postcard was mailed from new york .

从邮戳上可以看出，这张明信片是从纽约寄来的。

Stamp with a postmark to indicate date and time of mailing .

用邮戳标记以表明邮寄的日期和时间。