by ear

• The girl never took piano lessons . she plays the piano by ear
  这个女孩从没上过钢琴课，她是靠听觉演奏钢琴的。
• He had no time to prepare for the party , so he had to play by ear
  他没有时间为这次聚会做准备，只好随机应变了。
• Let ’ s just play it by ear
  让我们随机应变吧！
• He had no time to prepare for the party , so he had to play by ear
  他没有时间为这次聚会做准备，只好凭记忆演奏了。
• Iv . by ear - piercing , tattooing or acupuncture using contaminated instruments
  Iv .使用带病毒的工具穿耳孔纹身或针灸
• Let ' s just play it by ear
  我们就瞧着办吧！ ”
• He had no time to prepare for the party . so he had to play by ear
  他没有时间表为这次聚会做准备.只好凭记忆演奏了
• I will just play it by ear
  我自己随机应变。
• Let ' s just play it by ear
  我们就瞧著办吧
• I ' ll just play it by ear
  我到时随机应变。