It has size classes for object sizes that are a power of two minus a constant.

它有一些用于对象大小的size类，这些对象的大小为2的若干次幂减去某一常数。

youdao

And class size is pretty small if you go up to, you know, advanced level classes.

班级挺小的，如果，你知道，你去上高级课程的话。

要考入大学 - SpeakingMax英语口语达人

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