BBC在线收听下载:天文学家发现含七个类地行星的行星系统特拉普1号

短语讲解：

1. The World Trade Organization says a deal, which is described as the biggest reform of global trade in a generation has come into effect.

come into effect 实行，实施; 行之有效
例句：The new law will come into effect next month.
新的法律下个月生效。

2. Mr. Bayrou said there was an urgent need to join forces in the face of challenge from the anti-immigration party, National Front.

in the face of 面对
例句：He took his courage in both hands in the face of danger.
他迎着危险勇往直前。

3. Demonstrators opposed to the building of an oil pipeline under a lake in North Dakota in the United States have set fire to tents in their protest camp, shortly before a deadline to leave expires today.

set fire to 放火烧， 点着了…; 激起
例句：The invaders wantonly set fire to Yuan Ming Yuan.
侵略者恣意妄为, 把圆明园付之一炬。