短语讲解：

1. The treaty would be signed in 2015 and take effect after 2020.

take effect 生效，奏效
例句：The medicine will soon take effect.
这种药很快就会见效。

2. Several environmental groups walked out of the climate talks earlier this week.

walk out 罢工；走出去
例句：Some journalists threatened to walk out.
一些新闻记者也威胁要罢工。

3. The plants are responsible for one-third of the global warming emissions.

be responsible for 为…负责，形成…的原因；主管
例句：You must be responsible for what you have done.
你必须对你所做的一切负责。

4. No one is proposing standards that would knock out all those power plants.

knock out 击倒；淘汰
例句：Knock out 20 enemies in melee combat.
在战斗中击倒20名敌人。



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