例句：1. Three years ago he clerked in a bank.三年前他在一家銀行裏當職員。2. She ticked off three items on the list.她用記號標出表格上的.三個項目。3. I had only danced with Mary about three minutes when someone cut in.我和瑪麗剛剛跳了大約三分鐘的舞，就有人來截舞。
