1、drop out
退學;退出(比賽等)
He'd dropped out of high school at the age of 16.
他 16 歲的時候就從中學退學了。
She dropped out after 20 kilometres with stomach trouble.
20 公里后她因胃痛而退出了比賽。
拒絕接受傳統規范;離經叛道;擯棄社會習俗
She encourages people to keep their jobs rather than dropping out to live in a commune.
她鼓勵人們堅持工作而不是離經叛道地去過公社生活。
2、challenge
挑戰;難題
I like a big challenge and they don't come much bigger than this.
我喜歡大的挑戰,而所有挑戰中再沒有比這更大的了。
The new government's first challenge is the economy.
新政府面臨的第一個難題是經濟問題。
(成功地)應對挑戰,迎接挑戰
The new Germany must rise to the challenge of its enhanced responsibilities.
一個嶄新的德國必須迎接挑戰,承擔更多的責任。
They rose to the challenge of entertaining 80 schoolchildren for an afternoon.
他們一個下午成功接待了80名學童。
懷疑,質疑(真實性、價值、權威等)
Democratic leaders have challenged the president to sign the bill.
民主黨領袖對總統簽署這項法案提出了質疑。
The move was immediately challenged by two of the republics.
此項動議立即遭到其中兩個共和國的反對。