BBC在线收听下载:前伦敦市长鲍里斯退出英首相竞选

短语讲解：

1. The contest to become the leader of Britain's governing Conservative Party and Prime Minister has taken a dramatic twist, with the man widely-tipped for the post Boris Johnson pulling out of the race

pull out of 退出，取消
例句：The circus is planning to pull out of the suburb park tomorrow morning.
马戏团计划明天上午离开城郊公园。

2. The judge said he'd been swayed by new evidence uncovered by a spin-off podcast called Undisclosed, which followed up the story, after Serial became the most popular podcast of all time.

follow up 把…贯彻到底，对…采取进一步行动
例句：He failed to follow up my suggestion.
他没有照着我的建议做下去。

3. Commemorations are taking place to mark the 100th anniversary that started the Battle of the Somme, one of the bloodiest encounters of the First World War.

take place 发生，举行
例句：His graduation will never take place if he doesn't get to work.
如果他不下功夫，就永远不会毕业。