■three years after his flight over the North Pole 意思是“飛越北極之后三年”，若要表示“飛躍北極之后的3年里”，根據不同語境的需要，以下說法均有可能：　　

during [in, for] the three years after his flight over the North Pole　　

■“在她獲得諾貝爾獎的第三年”的英語可以是：the third year after she received the Nobel Prize　　

two days later 和after two days 通常可換用。如：　　

He came back after three days.= He came back three days later. 三天后他回來了。　　

I met her again three years later.= I met her again after three years. 三年后我又見到了她。　　

用 two days afterwards 表示“兩天后”好像很少見。英語通常將afterwards單獨使用。如：　　

Let’s go to the theatre first and eat afterwards. 咱們先去看戲，然后再吃吧。　　

Afterwards you can talk to whoever you like. 然后，你就可以同你樂意交談的人說話。　　

有時與soon, shortly, immediately, not long等搭配使用。如：　　

Soon afterwards we got a letter. 不久之后我們收到了一封信。　　

Our team scored another goal almost immediately afterwards. 我們隊幾乎是緊接著又進了一球。　　

I needn’t have written to him because he phoned me shortly afterwards.  我本來不需要給他寫信，因為不久之后他就給我打了電話。　　

類似 days / years afterwards 之類的表達，但那通常不是表示“幾天 / 幾年后”，而是表示“之后的幾天 / 幾年”。如：

The experience haunted me for years afterward. 在之后的幾年里我常常想起那次經歷。