Because congestion prevents ships heading back to pick up new cargoes, it has helped to push prices up further. 由于拥堵使船只难以返回运载新的货物，起到了进一步推高价格的作用。
Some drivers will switch to the bridge to shorten theircommute, but as the traffic builds up there the motorway starts to look like abetter bet, so some switch back. 一些司机为了缩短行程选择走桥，但当桥上变得拥堵时，高速路似乎是更好的选择，因此一些司机又折返回来走桥。
The fire won't burn because the flue is blocked up. 因烟道堵塞火烧不起来。
Clogged pipes backed up drain water. 阻塞的水管堵塞了沟水。
用作及物动词 (vt.)
She has almost nobody to take up for her. 她几乎没有人支持。
The people are at the back of the government. 人民是支持政府的。
The regime had been propped up by foreign aid. 该政权是靠外国援助维持著的。
He turned his back on his own family when they did need help. 他的家庭正需帮忙时，他不予援助。
The car backed up and hit the tree. 汽车倒退撞在树上。
The steps are easy to trace back. 易于将这些步骤倒退回去。
You can back up and restore full-text catalogs. 可以备份和还原全文目录。
This option will back up files on the volume. 该选项将备份卷中的文件。
