1. be famous for The small town is famous for its beautiful scenery.
be famous as He is famous as a writer.
2. diet 日常饮食 go on a diet ;be on a diet按菜谱进食,减肥.
He is on a diet. He lives on a diet of rice.
3. chiefly =largely主要的 The accident happened chiefly because of your carelessness.