to and fro motion 往复运动
to-and-fro 往复的 ; 动摇的 ; 来来往往 ; 来来往往的
to-and-fro movement 往返运动 ; 往复运动 ; 来回摆动
to and fro phrase 来来回回
to and fro adverb 来回地 ; 往复地 ; 往返地
flit to and fro 飞来飞去
to-and-fro bottle rocker 往复式摇瓶机
to and fro murmur 往返性杂音 ; 来回性杂音
She stood up and began to pace to and fro.
她站起来开始来回地踱步。
She rocked the baby to and fro.
她来回摇动着婴儿。
The ship was rolling heavily to and fro.
轮船剧烈地颠簸着。
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