keen on stamp collecting

• 爱好集邮

keen on stamp collecting的用法和样例：

例句

1. He goes in for stamp collecting.
   他爱好集邮。
2. Judy collects stamps, and the stamps on the envelope made her mouth water.
   朱蒂爱好集邮，所以这信封上的邮票颇使她心动。