Control object, as a transaction context object, is passed through the whole transaction process from beginning to the end.

在整个事务处理过程中，作为事务上下文对象传递控制对象。

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When a transaction starts, the scope key for this transaction is added to this context object.

当一个事务开始时，这个事务的范围键被添加到这个上下文对象中。

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One caveat here is that service object local calls do not go through the transactional proxy, and thus will always occur in the transaction context of the caller.

这里需要注意的一点在于，服务对象本地调用并不经过事务代理，因此将始终在调用者的事务上下文中进行。

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