寄信的用法和樣例：
例句
-
他們收到許多來(lái)信，寄信人向他們表示同情和祝福。
They received many letters of sympathy from well-wishers. -
我去郵局寄信。
I went to the post office to mail the letters. -
寄信前，他在信封上寫(xiě)上地址。
He addressed the envelope before mailing the letter. -
寄明信片比寄信便宜嗎？
Be postcard cheaper to send than a letter?
