短语讲解：

1. Police say at least 14 people have been killed in a mass shooting in Southern California.

at least 至少
例句：In fact it requires at least n generators.
事实上，它至少要有n个元素。

2. He said several local and state security forces took part.

take part [体] 参加比赛
例句：It's mostly young people who take part.
参加活动的绝大多数是年青人。

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