VOA慢速英语:US Investigates, National Guard Arrives in Ferguson

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短语讲解：

1. But what is important is that the security forces have arrived at the dam and they were able to capture the dam and conduct a full check around it to make sure that it's empty of bombs and explosive charges.

arrive at 到达; 来到
例句：I arrive at my hotel late in the evening.
傍晚时分，我到达了预定的酒店。
make sure 把事情弄清楚，核实或查明某事物
例句：I'll have to make sure I'm not chased. 
我一定想办法不叫他们发现。 

2. However, a rebel spokesman denied his forces were involved in the attack.

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. Pope Francis called for better relations between North and South Korea.

call for 去接（某人）; 去取（某物）; 需要; 要求
例句：Different circumstances call for different tactics. 
不同的情势需要不同的策略。