天很热，于是他就解开纽扣，露出胸膛。
It was very hot so he unbuttoned his jacket to bare his chest.
汤姆，你往头上浇水的时候，不必拆掉我给你衬衫上缝的领子吧？把上衣的纽扣解开！
Tom, you didn't have to undo your shirt collar where I sewed it, to pump on your head, did you? Unbutton your jacket!
他解开了衬衣纽扣。
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