蒋健棠英语实用句子(123):Cars can be backed up for miles
In a bad traffic jam, cars can be backed up for miles.
在严重交通堵塞时，车龙可能长达几英里。
back up 有支持和援助的意思(看下例)，用做被动语态时，back up也有堵塞的意思。
I always back you up.
我总是会支持你的。
The traffic is backed up.
交通堵塞。
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蒋健棠英语实用句子(123):Cars can be backed up for miles：等您坐沙发呢！