1、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。

2、pull up

（車或駕車者）減速停下

The cab pulled up and the driver jumped out.

出租車減速停下，司機跳了出來。

（使）突然停下；（使）猛地停住

Suddenly, he pulled up sharply in his stride, and fell to the floor.

突然，原本大步流星的他猛地停住了腳步，倒在了地上。

She recognized at the same instant Rachel's presence. It pulled her up short.

雷切爾一出現她就認出她來了，隨即停下了手中的活兒。

提高；改進

We had a very good mathematics mistress who pulled me up.

我們有個很出色的女數學老師，她幫我提高了水平。

He was made redundant and now he's trying to pull himself up again.

他之前作為冗員被裁，現在他正試圖再一次奮發圖強。