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Verbs Nouns Adjectives/Adverbs Pronouns Prepositions Conjunctions
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彼はこの分野の専門家です。

He is an expert in this area .

(ENG )
(JA )

(1920)

彼は外科の分野の専門家です。

He is an expert at surgery .

(ENG )
(JA )

(1921)

This problem is in his field .