1、challenge

挑戰(zhàn);難題

I like a big challenge and they don't come much bigger than this.

我喜歡大的挑戰(zhàn)，而所有挑戰(zhàn)中再?zèng)]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(gè)難題是經(jīng)濟(jì)問(wèn)題。

(成功地)應(yīng)對(duì)挑戰(zhàn)，迎接挑戰(zhàn)

The new Germany must rise to the challenge of its enhanced responsibilities.

一個(gè)嶄新的德國(guó)必須迎接挑戰(zhàn)，承擔(dān)更多的責(zé)任。

They rose to the challenge of entertaining 80 schoolchildren for an afternoon.

他們一個(gè)下午成功接待了80名學(xué)童。

懷疑，質(zhì)疑(真實(shí)性、價(jià)值、權(quán)威等)

Democratic leaders have challenged the president to sign the bill.

民主黨領(lǐng)袖對(duì)總統(tǒng)簽署這項(xiàng)法案提出了質(zhì)疑。

The move was immediately challenged by two of the republics.

此項(xiàng)動(dòng)議立即遭到其中兩個(gè)共和國(guó)的反對(duì)。

2、platform

（通常作為架放或著陸用的）平臺(tái)

Some of these flood shelters are on raised platforms, which have allowed government helicopters to land amid the continuing floods.

其中一些防洪棚搭建在高臺(tái)上，高臺(tái)可供政府的直升機(jī)在持續(xù)的洪水中降落。

They found a spot on a rocky platform where they could pitch their tents.

他們?cè)谝粔K巖石平臺(tái)上找到了一個(gè)可以搭帳篷的地方。

（政黨的）綱領(lǐng)，政綱，宣言

a platform of political and economic reforms.

政治和經(jīng)濟(jì)改革綱領(lǐng)

The Socialist Party won a landslide victory on a nationalist platform.

社會(huì)黨憑借民族主義政綱贏得了壓倒性勝利。

（公開發(fā)表意見或表達(dá)愿望的）機(jī)會(huì)，論壇

The demonstration provided a platform for a broad cross section of speakers.

示威集會(huì)為具有廣泛代表性的人士提供了發(fā)表意見的機(jī)會(huì)。