The locks are released when the process ends or when a commit operation releases locks that were acquired during a unitof work (UOW).
当进程结束，或者当提交操作释放在工作单元(unit of work, UOW)期间获得的锁时，锁就被释放。
2
A message set is a group of messages that need to be treated together as one atomic unit during a reorder operation.
消息集合(Message set)是一组需要在重排操作期间作为一组原始单元处理的消息。
3
Control of ambient temperature is particularly critical when one apparatus is stacked above another, because the heat generated from the lower unit can interfere with the operationof the units above.