慢速英语:Barbara McClintock, 1902-1992: She Made Important Discoveries about Genes and Chromosomes

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词汇讲解：

1. doctorate n. 博士头衔
例句：He earned his doctorate in philosophy. 
他获得了哲学博士学位。 

2. include vt. 包括,包含
例句：The price includes both house and furniture.
价钱包括房子和家具。

3. presentation n. 赠送;授予
例句：The presentation of prizes will begin at three o'clock.
颁奖仪式将在三点开始。

4. discuss vt. 讨论,商谈
例句：Mr. Wood refused to discuss the matter.
伍德先生拒绝讨论这件事。

5. explain vt. 解释;说明;阐明
例句：He explained that he had been cheated.
他解释说他是上当受骗了

6. recognize vt. 认出,识别;认识
例句：The policeman recognized her as a pickpocket.
警察认出她是个小偷。

7. observation n. 观察;观测;观察力
例句：This is contrary to actual observation. 
这种情况与实际观测恰恰相反。