评论
打印
1.Wind causes the mast to oscillate, or move back and forth.
back and forth 来来往往地；(前后)来回(地)；来来往往地；交互地；反复地；翻来覆去地
She passed the needle through the rough cloth, back and forth.
她一针一针地缝那块粗布。
The prosecution and defense were bandying accusations back and forth.
原告和被告你来我往，互相指责。
2.It does not spin around. So it creates no risk to birds and bats.
spin around 转圈圈；转身；原地旋转；原地打转
The boat started to spin around in the water.
船开始在水中打旋。
The propeller started to spin around.
螺旋桨开始飞快地旋转起来。
