principal

The high school principal announced the new rules during the morning assembly.

(Chinese) 高中校长在晨会上宣布了新规则。

He was sent to the principal's office for disrupting the class.

(Chinese) 他因为扰乱课堂秩序而被送到了校长室。

Rice is the principal crop grown in the southern regions of the country.

(Chinese) 稻米是该国南部地区种植的主要农作物。

The principal reason for the project's delay was a lack of experienced engineers.

(Chinese) 项目延期的主要原因是缺乏有经验的工程师。