3.Probably good if this is the same type of unit as the target, though not required.
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Probably good if this is the same type of unit as the target, though not required.
也许好，如果这是单位为同一类型的目标，但不是必需的。
It is acceptable, though not required, to remove unwanted keys from copies of the sets above.
从上述的集合副本中删除不必要的键，是可接受的，但并不是必需的。
Implementing an EJB tier, though not required, lays the foundation for creating a highly scalable, distributed application architecture.
虽然没有要求实现ejb层，但这样做可以为建立高度可伸缩的分布式应用程序架构提供基础。
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