COMB in N-COUNT （与名词连用构成新的名词）表示“…观察者”，“…注视者” -watcher combines with nouns to form other nouns that refer to people who are interested in a group of animals or people, and who study them closely. （与名词连用构成新的名词）表示“…观察者”，“…注视者”
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The bird-watchers crept about in the bushes.
观鸟者在灌木丛中蹑手蹑脚地走来走去。
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Royal-watcher Mary Hayes said: 'It looks like it is going to be an unhappy time for the Queen.'
皇室观察员玛丽·海斯说：“看来女王接下来的日子不太好过。”