VOA慢速英语:China Races to Find Ferry Accident Survivors

短语讲解：

1. Police in northern Afghanistan said Tuesday unknown gunmen have shot dead at least nine employees of an aid agency.

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. American telephone companies will take over the task in six months.

take over 接管; 带; 帮…学习; 在…上花费
例句：Have a rest. I'll take over.
你歇会儿, 我来替你。