您要查找的是不是：
- 天然natural
- 天然的unlearned
- 笨鸟先飞A slow sparrow should make an early start.
- 天堂鸟bird of paradise
- 天然橡胶caoutchouc
- 大鸟curassow
- 鸟叫chirp
- 不死鸟the secular bird
- 天然纤维natural faric
- 鸟网trammel net
- 千鸟plover
- 天然食品natural food
- 驼鸟ostrich
- 生药学药理学的一个分支，研究处于天然或原始状态的药物The branch of pharmacology that deals with drugs in their crude or natural state.
- 不论人还是鸟都愿意往高处攀。Men and birds are fain of climbing high.
- 天然产物natural product
- 一石二鸟kill two birds with one stone
- 天然药物化学Natural Medical Chemistry
- 黄鹂鸟yellowbird
- 天然资源natural resources
