smile/grin from ear to ear 笑得合不攏嘴
He smiled from ear to ear when he received this birthday gift.
當他收到這生日禮物時笑得合不攏嘴。

talk one's ear off 喋喋不休
I’m sorry to talk your ear off, i just need somebody to talk to.
不好意思，對妳說了這么久，我只是想找一個人傾訴。

play it by ear見機行事
He can play it by ear and handles everything in order.
他能隨機應變，所以他把一切事物處理的井井有條。

keep an ear to the ground 保持高度警覺，及早發現那些即將發生的事情的預兆
Reporters keep an ear to the ground so as to know as soon as possible what will happen.
記者們注意輿論的動向，以便盡早知道將要發生的事情。

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