慢速英语:Health Report--The H7N9 bird flu virus

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短语讲解：

1. He spoke to reporters in Beijing last week about the H7N9 bird flu virus.

speak to 对…讲；围绕…谈
例句：Do they speak to each other?
她们之间是否相互交谈？

2. As of Monday, the virus had killed at least 24 people on the Chinese mainland.

at least 至少
例句：Can we at least try?
我们至少试试看吧？

3. The government has carried out thousands of tests on birds but only a small percentage were infected.

carry out 执行；进行
例句：We must carry out it wholeheartedly indeed.
我们必须尽力把它贯彻到底。