knock at的意思
问题描述：
knock at的意思
答
knock:[ nɔk ] n.敲,敲打,敲门v.敲击,互撞,攻击Examples:1.He knocked a big hole in the wall.他把墙撞出了一个大洞.2.Did you hear the knocks at the door?你听到敲门声了吗?3.Someone is knocking at the d...