邮票是怎样开始被使用（投入应用）的?
当你要寄信时,你必须在信封上贴邮票.
人们什么时候开始使用邮票呢?是谁最先想出这个主意的呢?
不是spend吧,是send
英语翻译How Did Stamps Come into Use?When you spend a letter,you
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