2. With a swoop of his shining ax, the third tree fell. 随手把闪亮的斧头一挥，第三根树也倒下来了。
3. The children said they were still hungry so I put a plate of cakes on the table and at one fell swoop they vanished. 孩子们说他们仍然饿着，于是我放了一盘蛋糕在桌子上，结果蛋糕一下子就不见了。
英英解释
n.
1. (music) rapid sliding up or down the musical scale
2. a very rapid raid
3. a swift descent through the air v.
1. move down on as if in an attack
2. move with a sweep, or in a swooping arc
3. seize or catch with a swooping motion
