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。

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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。

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The day before my graduation from a high school in St. Louis, the principal called an assembly.

我从圣·路易斯毕业的前一天，校长召集我们开了个会。

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Thank you, Principal Schaeffer, for letting us hold this little assembly here at the high school. (Laughter.) The principal was bragging about both the basketball team and the football team.

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