occur

vi.

1. 发生; 举行; 存在
   • I hope this won't occur again.
     我希望不要再发生这种事情。
   • Silver occurs natural.
     银是天然存在的。
2. 被发现; 想到[起]
   • The word “gratitude” did not occur in his words.
     “感激”两字在他的话中是见不到的。