这一版本更新的关键改善之处在于能够移动和重新排序消息和生命线。

The key enhancements are the ability to move and reorder messages and lifelines.

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对更复杂的事物，试想同样的产品线有一个以前的版本，1.0版本——同样继续交付维护版本（版本1.1,1.2,1.3等等）。

To further complicate matters, imagine that this same product line had a previous release, Version 1.0, which is also continuously delivering maintenance releases (Versions 1.1, 1.2, 1.3, etc.).

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因为一方面而言，UT P线缆要求已经再次升级到CAT - 5e版了，另一方面100 BASE - T使用了四对绞线——同一时间，两个走向。

For one thing, the UTP cabling requirements were upped again to category 5e, and 1000base-t USES all four twisted pairs-in both directions at the same time.

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