as luck would have it —As luck would have it, there was no one home. 不巧的是,没人在家 —As luck would have it, he recovered his lost watch. 幸运得是,他找回了他丢失的表。 =幸运的是,不幸的是,碰巧
as ... go This butterfly is tough and powerful as butterflies go and is capable of long flights at speeds of 20 miles per hour or more. 就蝴蝶而言,这种蝴蝶强劲有力,能够以时速20英里以上的速度长途飞行 =就...而言
back up The accident backed the traffic up for blocks. 事故导致交通堵塞了几条街 Traffic backed up in the tunnel. 交通在隧道里堵塞起来 =To cause to accumulate or undergo accumulation 使堆积,堵塞