unable

adj.

不能的，不会的；无能力的，不熟练的；不能胜任的；〈罕，诗〉弱，无力的

unable to establish不能成立

1. He is an able person, nothing is unable to him.
   他是一个能人，对他没有不能的事。
2. Despite our great advances in microbiology, we are still unable to differentiate these organisms that cause the different infections.
   不管我们的在微生物学的大进展，我们仍然是不能的区分引起不同的感染的这些有机体。

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