noun 下载 🔗分享 气动邮递系统,气动信件。 The pneumatic postal system in Paris (abolished 1984), or a letter sent by this system. Examples : ""Grand-père reminisced about sending urgent messages across Paris using a pneumatique before telephones became common." " 在电话还不普及的时候,爷爷回忆起当年用巴黎的“气动邮递系统”发送紧急信件的情景。 communication technology history writing service system machine 与AI对话词汇游戏阅读练习