BBC在线收听下载:美国总统大选激烈程度超预期

1. Republicans are stepping up campaigning for the US presidential election as polls suggest a tighter race unanticipated.

step up 走上; （使） 增加; （使） 加快速度
例句：He urged donors to step up their efforts to send aid to Somalia
他敦促各捐赠方加快速度将援助物资送往索马里。

2. The Paris Agreement on climate change has come into force,obliging government to keep the global temperature no higher than 2 degree celcies above pre- industrial levels.

come into force 开始生效
例句：The first price increases are due to come into force in July
第一批提价预计将在7月开始执行。

3. Scientists say the world will need to cut greenhouse gas emissions by as much as 14 billion tons by 2030 to meet the target.

as much as 差不多
例句：I try to ward off fatigue by resting as much as possible.
为了防止疲劳，我尽可能多休息。

4. The leaders of Turkey's pro-Kurdish HDP Party have been detained along with at least five fellow MPs.

at least 至少
例句：At least, I sincerely hope so.
至少我是真诚地这样希望的。