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in response to作为对…的答复,响应…,应…
例句：The workers went on strike in response to the company's downsizing.
工人们罢工抗议公司裁员。
2.Fighting has broken out between security forces in Gabon and opposition supporters as Ali Bongo, the son of the late President, Omar Bongo was declared the winner of Sunday’s presidential election.
break out突发,爆发,叫嚷
例句：The Lugouqiao Incident broke out in 1937.
卢沟桥事变在1937年爆发。
3.He described the world as heading into an abyss on climate change unless leaders quickly step up progress towards a new UN treaty.
step up走近,逐步增加,提升,提高
例句：step up the reform; increase the impact and momentum of reform
加大改革的力度