It is cheaper to have extra building work done when the builder is on site, rather than bringing him back for a small job.
趁建筑工人在工地上时叫他们完成额外的建筑工作要比叫他回来做一点小工便宜。
You might need an activity that does nothing at all, such as when you have a construction that requires an activity, but there is no work to be done.
您可能需要一个根本不执行任何工作的活动，例如，当您拥有一个需要某个活动的构造，但没有要执行的任何工作时。
When transactional work is done, it is managed under the transaction context and completed when this context is called to commit or rollback.
当事务工作完成，在事务上下文里管理它，当调用这个上下文去确定或会滚时这个工作完成。
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