bachelor

单身男子、未婚男子、单身汉

He stayed a bachelor until he was nearly fifty.

他一直单身到将近五十岁。

学士、学士学位

She earned a bachelor of science in marine biology.

她取得了海洋生物学的理学士学位。

单身男子的、单身汉的限定用法

His bachelor days ended the moment the twins arrived.

双胞胎一出生，他的单身生活就结束了。