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.
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。