1·Perhaps this is because, had they used Fragment partitioning exclusively, the single model/LU would have proven to be inconvenient as the basis for publishing the model.
也许这是因为他们一旦排外地使用了片断划分，单个的模型/逻辑单元就将被证明为并不方便作为发布该模型的基础。
2·In the current versions of the software, when you create, open, close, rename, delete, or combine "UML models," you are actually performing those actions on an LU.
在软件的当前版本中，当您创建、打开、关闭、重命名、删除、或者联合“uml模型”的时候，您实际上是对逻辑单元执行那些操作。
3·In other words, to open a Fragment, you must open the LU to which it belongs.
换句话说，要打开一个片断，您就必须打开它所归属的逻辑单元。
4·Merges will be complex, and context for those merges will be lower, but model/LU footprints will be smaller and collisions slightly less frequent.
合并将是十分复杂的，而且用于那些合并的上下文关系并不密切，但是模型/逻辑单元的足迹将会更小，并且冲突更加不频繁。