罕用药研发主要面对两方面的困难，一方面是病患人数少，商业价值有限，另一方面是病例不足。
The main difficulties of Orphan Drug Research and Development is by both sides, on the one hand, the small number of patients, limited commercial value, on the other hand, insufficient cases.
罕用药研发主要面对两方面的困难，一方面是病患人数少，商业价值有限，另一方面是病例不足。
The main difficulties of Orphan Drug Research and Development is by both sides, on the one hand, the small number of patients, limited commercial value, on the other hand, insufficient cases.
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