The first lady said the plan also includes increasing the number of high school students who take part in physical education classes.

VOA: special.2010.06.07

which is basically an extensive number of classes that everybody has to take if you're in Columbia College,

基本包含了大量的课，而且每个哥伦比亚的学生都要上，

哥伦比亚大学的教程 - SpeakingMax英语口语达人

You begin with three classes and a number of other classes are available to unlock either through in-game experience points (earned during matches) or by paying cash.

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The game features a number of classes, all of which can be upgraded to advanced classes at level 10, giving you a wide variety of class and skill options that affect movement, attack, and special powers, as well as defense stats.

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In Chad, first year classes number an average of 85 students.

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