Some of them have the capability of becoming white blood cells, or leukocytes, of which there are many different subsets.

一些能够成为白细胞,或称白血球,白细胞又分很多的亚类

耶鲁公开课 - 生物医学工程探索课程节选

Before becoming President Bush's White House Chief of Staff, he was President Bush's Director of the Office of Management and Bugdet for three years.

在成为小布什的,白宫办公厅主任之前，他是,小布什的管理与预算办公室主任,在那里工作了三年。

普林斯顿公开课 - 国际座谈会课程节选

Before becoming President Bush's White House Chief of Staff, he was President Bush's Director of the Office of Management and Budget for 3 years.

在成为布什总统的,白宫办公厅主任之前，他是布什总统的,白宫管理与预算办公室主任,任期三年。

普林斯顿公开课 - 国际座谈会课程节选