to play by ear

下面我们要讲的一个习惯用语是： to play by ear

例句-3："I haven't had a chance to prepare any notes so all I can do is start talking and play it by ear."

这话的意思是：“我今天没有什么准备，所以就只好讲到那儿就算那儿了。”

下面一个例子是一个人在和朋友约会：

例句-4:"I am not sure if my wife wants me to go shopping with her on Sunday. If she decides to go with her sister instead, then I can play tennis with you. Let's just play it by ear."

他说：“我还不知道星期天我太太是否要我陪她去买东西。要是她决定和她姐姐一起出去，那我就能和你去打网球。我们就瞧着办吧!”