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. (加在名词后构成其他名词)表示“…观察”，“…研究”
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.