VOA慢速英语:U.S. Senator Rand Paul Announces Presidential Campaign

短语讲解：

1. Some Iranian lawmakers had called for Mr. Erdogan’s visit to be canceled after he publicly supported the Saudi-led air campaign in Yemen against Iran-supported Houthi Shi'ite rebels.

call for 需要
例句：Different circumstances call for different tactics. 
不同的情势需要不同的策略。 

2. The U.S. Homeland Security Department said there is "no indication” that the power outages were linked to terrorism. 

link to 与…连接， 联系
例句：Bonus payment is link to productivity. 
奖金与生产率挂钩。