短语讲解：

1. Those most at risk are the very young, the older adults (over the age of 65) and anyone with a weak immune system.

at risk 有危险
例句：The report underlined his concern that standards were at risk
报告强调了他对道德水准可能会受影响所表示的关注。

2. So, it is best to seek out trained medical help.

seek out 找出; 找到; 物色
例句：Now is the time for local companies to seek out business opportunities in Europe
对于当地公司来说，现在是时候去欧洲寻求商机了。

3. The recovery time is similar to that for viral pneumonia.

be similar to 类; 与…相似; 类乎
例句：This behavior is similar to buckling of strut.
这种状态类似于压杆的屈曲。

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