慢速英语:Security Tightened for US Political Conventions(翻译)

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短语讲解：

1. And he is concerned about demonstrations at the conventions “getting out of hand.”

concern about 使（自己）关心…
例句：She showed great concern about you.
她很为你担心。

2. We’re going to make sure we stay vigilant,” said Cleveland Police Chief Calvin Williams.

make sure 把事情弄清楚，核实或查明某事物
例句：I think it is true, but you had better make sure.
我想这是真的，但你最好证实一下。

3. But people with firearms will be able to carry them in areas that surround the convention site, as long as they are holstered.

as long as 只要; 如果; 既然; 由于;
例句：As long as I breathe, I will fight them.
只要一息尚存，我就要跟他们斗。