differential 副詞 （差別的）
differentiation 名詞 （分別、不同化）
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例句：
1.What are the difference between words "difference", "differential" and "differentiation"?
2. The differential diagnosis of headache includes migraine, meningitis, any infection, tension headache, trauma and vascular disease.
3. Differentiation of basal cell to different cell types occurs during first two months of life.