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【语法和句型】
1. Authorities were searching for people who might have come into contact with the man.
come into contact with 表示“接触到，和……接触，碰到”，例如：
He come into contact with a lot of new idea while work abroad.
在国外工作期间他接触到许多新的思想。
This gave us a chance to come into contact with workers and peasants.
这给了我们机会来接近工农。
Especially when you go down there and come into contact with concrete matters, you will discover many problems.
特别是你们下去以后，亲身接触具体情况，会发现许多问题。
2. health officials remain concerned that it could become more lethal over time.
over time 表示“随着时间的过去”
