COMB in N-UNCOUNT
(加在名词后构成其他名词)表示“…观察”，“…研究”
-watching combines with nouns to form other nouns which refer to the activity of looking at a group of animals or people and studying them because they interest you.
例句
Whale-watching has become a growth leisure industry...
观鲸业已经成为一个快速发展的休闲产业。
He is said to have invented the sport of celebrity-watching.
据说是他发明了观赏名人这项活动。