We know he was a keen observer because he was also an author.

我们之所以知晓他是个热衷的观察者，是因为他同时也是一个作家。

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On the other hand, you seem to be a keen observer and analyst.

另一方面你似乎是一个热心于观察和分析的人。

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Gil is a keen observer, "I watch people drive and waste gas every day."

吉尔是个非常敏锐的观察者，“我每天都会看着人们开车并且浪费汽油。”

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Political blogger Alan Meban is a keen observer of party conferences.

BBC: Abortion on Sinn Fein conference agenda

But that was Cramer, agree his friends, an occasionally shambling presence who was also a keen observer, a raconteur, a baseball fan, a master of ceremonies. (He served the latter role at Pakenham's wedding.) Ward imagines him in another time, another place, holding court with some other witty friends.

CNN: STORY HIGHLIGHTS