The envelope was postmarked Helsinki.

该信封上盖有赫尔辛基的邮戳。

The card was postmarked Tokyo 9th March.

明信片上盖着东京3月9日的邮戳。

The parcel was postmarked London.

这件邮包盖着伦敦的邮戳。

The envelope was postmarked "San Leandro."

信封上邮戳的地点是圣利安德罗。

It was postmarked from London and had the faintest aura of grease.

从邮戳看是发自伦敦的，上面已经布满模糊混乱的油渍了。