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in response to作为对…的答复,响应…,应…
例句：He opened the door in response to a knock.
他应敲门声而开了门。
2.Amid very tight security, more than 50 heads of state and governments have descended on the island bringing with them hundreds of members of their entourages and local business leaders.
descend on突然袭击;突然访问
例句：Bob and his girl friend descended on us for the weekend.
鲍勃和他女友突然来我家过周末。
3.“We want to mark the path for the next ten years”, he said, referring to inter-continental dialogue on poverty eradication, mining and energy resources, trade and agriculture.
refer to谈到,提及;暗示,意指;参考,查阅;涉及,关于
例句：Our economy is referred to as a free market.
我们的经济被称为自由市场经济。
4.Some swept away after clinging to rooftops.
cling to紧紧抓住,紧附,坚持,依恋
例句：Small children cling to their mothers.
小孩子都缠着母亲。
5.Talks are under way between political parties in Sudan on the fragile peace process between the North and the South.
under way进行中,在行进
例句：The construction project got under way last week.
这建筑工程于上周开始进行。