应用因次分析法推导出表征巷（隧）道火灾烟流滚退距离变化规律的通用无因次表达式，该表达式包含影响滚退距离的火源热释放速率、通风风速、巷道倾角和形状等因素。
A non-dimensional expression, which shows the general variation of the backflow distance of smoke and hot gases during a roadway or tunnel fire, was derived through dimensional analysis.
中介流是作为事务提交或回滚的。
Mediation flows are committed as a transaction, or rolled back.
这些流都是事务型的，使用的是两阶段提交之类的机制，这样在失败时可以回滚整个流，或者在成功时提交整个流。
These flows are transactional, using mechanisms such as two-phase commit, so that the entire flow can be rolled back in the case of a failure, or committed in the case of success.
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