knocking down
问题描述：
knocking down
答
slam down
英 [slæm daun]
美 [slæm daʊn]
砰地一声关上
双语例句
1.A seagull swooped down in front of her car,causing her to slam on the brakes.\x09
一只海鸥突然扑到她的车前,她急忙猛踩刹车.
来自柯林斯例句
2.He threw his books down with a slam.\x09
他砰然一声将书摔在桌上.
slam [英]slæm [美]slæm
vt.砰地关上（门或窗）;猛烈抨击;使劲一推;猛劲一摔
vi.砰然关上;猛力打击,碰撞;撞到了一辆卡车上
n.猛然关闭的声音;猛击
[例句]Federer also equalled pete sampras 's record of 14 grand slam titles.
费德勒还追平了桑普拉斯14座大满贯桂冠的记录.