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pure; undiluted; raw; crude
「生」 has other readings with different meanings.
生のビールが一番おいしいと思う。
Draft beer is the most delicious.
この醤油は生で使うのが良い。
This soy sauce is best used undiluted.
生の声を直接聞くことが大切だ。
It's important to hear raw voices directly.