同时，UML 1 . x符号集合有时难以适用于较大的应用程序。
Also, the UML 1.x notation set was at times difficult to apply to larger applications.
而兽医却不具备这样的条件，所以概率统计法在兽医临床上难以适用。
Theveterinarian does not possess such condition, so the statistic law of probability is difficult to be applicable to in the veterinarian is clinical.
我国现行《民法通则》中对不可分之债并没有明确的规定，实践中难以适用。
In current China, "civil law" is not clearly defined the indivisible obligation, so difficult to apply practice.
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