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。
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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