要解释什么样的产品或服务实用其实很简单：人们会反复不断地经常使用它。
Explaining what makes a product or service useful is simple: it is something that people are using repeatedly and on a regular basis.
原因很简单：因为transient是可变的，在不同的线程中使用它将会非常危险的，所以需要同步。
The reason is simple: since the transient is mutable, using it from different threads would be dangerous and require synchronization.
很简单，在FTL许可证进行HA授权时，使用它就无需识别已授权的DB 2 Express服务器的活动级别。
Quite simply, there's no need to identify the activity level of a DB2 Express server licensed using an FTL license when it comes to HA licensing.
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