Our principal usually school in the Assembly Hall.
我们的校长通常在会议厅对所有的学生讲话。
2
In this article, the principal factors affecting hole curvature are analysed, the principle of anti-deflecting packed hole assembly design is discussed.
本文分析了影响井眼曲率的主要因素，论述满眼防斜钻具组合设计的原则。
3
The day before my graduation from a high school in St. Louis, the principal called an assembly.