1.echo的基本意思是“回音,反响”,引申可表示“重复”“随声附和”“反映”等。
2.echo既可用作不及物动词,也可用作及物动词。用作及物动词时,接名词或代词作宾语; 用作不及物动词时,常与back, with等词连用。

echo back(v.+adv.)
发出回声; 附和意见 return the sound or idea of (sth)
▲echo sth ⇔ back
The hill echoed back the noise of the shot.从山那边传来了枪声的回响。
This cave echoes back every word you speak.你在这个窑洞里说的每一个字都发出回声。
The valley echoed back her song.山谷里回响着她的歌声。
Why do you always have to echo back my opinions like this?你为什么总是这样非附和我的意见不可呢?
▲echo back from sth
The sound echoes back from the walls.这声音从墙壁发出回声。
The cry echoed back from the mountain.从山岭传来呼唤的回声。

echo in(v.+prep.)
在(某处)回响起 sound again in some place
▲echo in sth
Our voices echoed in the empty valley.我们的声音在空谷中回响。
The sounds of gongs and drums echoed in the great hall.大会堂里锣鼓喧天。
His words echoed in her ears.他的话在她的耳际回响。

echo off(v.+adv.)
(响声)渐渐远去 disappear slowly
▲echo off into sth
Their voices echoed off into the night.他们的说话声渐渐远去,消失在夜空之中。

echo with(v.+prep.)
(指某处)回荡(某声音) be filled with the repeating effect of (a sound)
▲echo with sth
The room echoed with the sound of music.音乐声在房间中回响。
The corridor echoed with footsteps.走廊里回响着脚步声。
The old house echoed with the children's laughter.那座旧房子里回荡着孩子们的笑声。
The cave was echoing with shouts.山洞内回荡着叫喊声。

用作不及物动词
▲S+～(+A)
The sound of the cannon echoed around.大炮的轰鸣声在四处回响。
The thunder echoed among hills.雷声在山间回响。
The cowbells echoed across the valley.牛铃的声音在山谷中回荡。
The sonorous voice of the speaker echoed round the room.那位演讲人洪亮的声音在室内回荡。
用作及物动词
▲S+～+n./pron.
The cavern walls echoed his cries.大山洞的四壁回响着他的喊声。
The child echoed his mother's words.这个小孩重复着他妈妈的话。
I should like to echo the words of the previous speaker.我想重复前面一位发言者的话。
His speech echoed my own feelings.他的讲话反映了我的感情。

［词源］＜拉丁语、希腊语ēkho(声音,回声)

to the echo
长时间而大声地long and loudly
The speaker was cheered to the echo.演讲者博得了高声喝彩。

She shouted “hello” and listened for the echo.她大喊“喂”,然后倾听回音。
I could hear the echoes in this temple.我在这座庙里能听到回声。
She has no original opinion; she's just his husband's echo.她没有主见,只是她丈夫的应声虫。
His words were no echoes in their minds.他讲的话在他们的心中没有引起什么反应。