up and down 可以后面跟东西,表示沿着什么来回; 也可以不跟东西.
He's pacing [up and down].
He walked [up and down the locker room].
这句话里up and down the line 应当连起来理解.
Several social wokers were carrying the poster [up and down the line].
一些社工举着海报在排队投诉的人群中来回走动.
up and down 可以后面跟东西,表示沿着什么来回; 也可以不跟东西.
He's pacing [up and down].
He walked [up and down the locker room].
这句话里up and down the line 应当连起来理解.
Several social wokers were carrying the poster [up and down the line].
一些社工举着海报在排队投诉的人群中来回走动.