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單詞與短語：
1. back up
對話中表示“（車輛）堵塞，排成長龍”的意思；
eg. A truck overturned on Zhongshan N. Rd. and caused traffic to back up yesterday.
一輛卡車昨天在中山北路翻覆，造成交通回堵。
eg. Traffic into London on the M11 was backed up for several miles.
進入倫敦的車輛在11號高速公路上堵了好幾英里。
2. should have done sth.
虛擬語氣，表示"過去本應該做某事卻未做"；
eg. The problem should have been ironed out months ago.
這個問題幾個月前就該解決了。
eg. He should have won the match—it was a near miss.
這場比賽本該是他贏的—真是功虧一簣。
