An airmailenvelope is usually made of very thin paper.
航空信封一般由非常薄的纸制作的。
2
The spiky handwriting on the airmailenvelope from London was obviously hers.
发自伦敦的航空信封上的尖长字迹分明是她的。
3
"I hear you're staying at Roger's place, " said the check-in girl, holding an airmailenvelope. "You wouldn't mind giving this to the barman there, would you?"