本文作者： Gabriella Van Leuven

VIP教师会员和本期电子版订户登录后下载

小小邮票，责任重大。词数 275 建议阅读时间 6分钟YOU walk your letter down the street to the local post office, stick a stamp in the corner and, in a few days…voila (瞧)! The letter has traveled across the world and arrived at a friend’s doorstep.