短语讲解：

1. U.S. Secretary of State John Kerry arrived at the meeting after visiting several Middle East nations.

arrive at 到达; 来到; 达成
例句：I arrive at my hotel late in the evening.
傍晚时分，我到达了预定的酒店。

2. She said survivors reported that the attackers were involved in the human trafficking trade.

involve in 使参与[陷入，牵扯到]
例句：Be you involve in the copyright affair.
你是否卷入著作权的事件之中。

3. The migrants refused, saying it was too dangerous. Ms. Berthiaume said a violent dispute broke out.

break out（战争、打斗等不愉快事件）突然发生，爆发; 突然发生
例句：A fire break out last night.
昨天夜里发生了一起火灾。

4. Flooding in India's Kashmir Valley has affected more than 2.5 million people.

more than 不只是; 很; 超过; 在…次以上
例句：Margaret needed support more than ever. 
玛格丽特比以往更需要关心。