This sort of hierarchical relationship is difficult to trace by just navigating through the model.
仅仅通过模型导航很难追踪这类层次关系。
Acute pancreatitis is a sort of general disease and one of the medical difficult problems.
急性胰腺炎是一种常见疾病，又是众多的医学难题之一。
On computer's application the programming of tree sort is difficult .
在计算机应用中，要实现树排序编程较难。
You may find this sort of job rather difficult, but if is just my cup of tea!
你或许认为这项工作相当难，但这正合我的意。
It is not difficult to sort out the materials as long as time permits.
整理这些材料并不难，只要有时间。
It is not difficult to sort out the materials as long as time permits.
整理这些材料并不难，只要有时间。
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