If you do something selfishly, you do it in a way that looks after you and does not look after other people. The word is almost always a telling-off. Parents, teachers, and friends use it when someone takes the last piece, keeps the best seat, or talks only about their own plans.

If you do something selfishly如果你selfishly地做某件事，you do it in a way that looks after you你做事的方式只顧到自己，and does not look after other people不顧別人。The word is almost always a telling-off這個字幾乎都是在說教訓人的話。Parents, teachers, and friends use it父母、老師、朋友會用這個字，when someone takes the last piece當有人拿走最後一塊、keeps the best seat佔了最好的位子、or talks only about their own plans或是只講自己的計畫的時候。

It is the adverb that belongs with selfish: you behave selfishly; you do not 'do selfish'.

It is the adverb that belongs with selfish這是跟selfish配對的副詞：you behave selfishly你會說you behave selfishly；you do not 'do selfish'而不會說'do selfish'。

Though actually people sometimes joke with it — 'I'm going to selfishly take the afternoon off' — and then it is lighter, a bit of pretend guilt. In a serious sentence, though, it still stings.

Though actually people sometimes joke with it不過其實有時候大家會拿它開玩笑——'I'm going to selfishly take the afternoon off'像「I'm going to selfishly take the afternoon off（我要自私一下，下午請假）」，and then it is lighter, a bit of pretend guilt這時候語氣就輕鬆多了，帶點假裝的愧疚感。In a serious sentence, though不過在正經的句子裡，it still stings這個字還是很刺人。

It is ordinary English, not slang and not high. You will hear it more when people talk about how someone acts than when they talk about things.

It is ordinary English這是普通的英文，not slang and not high不是俚語，也不是什麼很文雅的說法。You will hear it more when people talk about how someone acts你比較會在大家講一個人的行為時聽到它，than when they talk about things而不是講事情的時候。