Is being 20 years old a necessary or sufficient condition for being a college student?

就成为大学生而言，年满20岁是必要条件还是充分条件？

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Is having the flu virus in your blood a necessary or sufficient condition for being sick?

对生病而言，你血液里有流感病毒是必要条件还是充分条件？

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Is sunlight a necessary or sufficient condition for the roses to bloom?

阳光是玫瑰开花的必要条件还是充分条件？

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Having a mastery of a particular function such as finance, support, marketing, or engineering is a necessary, but not sufficient, condition for success.

FORBES: A New Era -- the Era of the Customer