Of course writing unit tests for rich components requires some experience, time and effort but it is an important part of application development.
当然，编写富组件的单元测试需要经验、时间和精力，但这也是应用开发的一个重要组成部分。
2
A good example is where a part of the composite application contains an intensive calculation that can be run in parallel to reduce the overall processing time.
一个好的例子就是组合应用中包含密集型计算的部分可以被并行运行，这会减少整体处理时间。
3
A session is a repository of data that can, at any time, be easily accessed by any part of an application.