And, quite unusually, these long chains cannot be destroyed by water or air or be attacked by bacteria.
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Nearly everyone catches colds occasionally, but some people catch colds quite frequently, and others tend to stay sick an unusually long time.
几乎每个人都捕捉偶尔感冒,但有些人感冒相当频繁,和其他人生病往往留一个异常长的时间。
I'm quite healthy. I very rarely get colds, although, unusually for me, I had a bad cold and a bit of a fever last week.
我相当健康。我很少感冒,尽管通常我是如此,上周我患了严重的感冒并且有点发烧。
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