随机应变

play by ear───凭听觉记忆演奏

play it by ear───随机行事；无计划地进行

play the harp───弹竖琴

set by the ears───引起争吵；在……之间制造麻烦，挑拨离间；（因新发现等）使震惊

displaced by the war───因战争而流离失所

play to the gallery───哗众取宠；讨好观众

down by the head───头朝下

Did you learn to play the guitar by ear or by reading music?───你学弹吉他时看乐谱还是不看乐谱？

I do is that I usually check the grammar first in Microsoft Word or just play it by the ear, depending on how much you trust your own English language skills.───我通常先在Microsoft t Word里检查语法或读出来用耳朵听，这取决于你对自己的英语语言技能有多大的自信。