同根派生 post bag相关词英汉例句I myself put one letter in that famous bag just before the aeroplane went up, and that letter, which was addressed to my wife in London, reached her safely.正好在飞机起飞之前，我自己也往那个著名的邮袋里投了一封寄给我在伦敦的妻子的信，信平安到达。post bag更多例句