【地道口语】play something by ear 见机行事。例如：I didn't have time to prepare for the job interview. I will have to play it by ear. 我没时间为面试做准备，只好见机行事了。He is a spur-of-the-moment kind of guy. He never has plans and plays everything by ear. 他干事喜欢心血来潮， ​从无计划，随机应变。