并且在持久化对象时，如果它们在相同的实体群中，那么它们只能被持久化到相同的原子事务中。

And when you persist objects, they can only be persisted in the same atomic transaction if they are in the same entity group.

youdao

正如每个整数都可用一些质数的积表示，任一对象的对称都可由所谓简单群的基本构件集合构造出来。

Much as every integer can be broken down into a product of prime Numbers, the symmetries of any object can be constructed from a collection of basic building blocks known as simple groups.

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最新的一些报告指出，随着中国对象牙需求的增长，森林象群的数量也在不断减少。

The latest reports suggest that the forest elephant population is collapsing on the back of rising Chinese demand for ivory.

youdao

A cohort study means you take the same group of people and follow them every five years for that period of time.

定群研究意味着你只有一组研究对象,然后在研究期间每五年进行一次记录数据

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选