He cautioned not to speak ill of others, saying, 'Illness enters by the mouth, and disaster does not come out of it.'

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In chemistry class, I learned about the reaction of pyruvate.

He faced difficulties with the spirit of 'one eye, two feet, three gallbladders, four strengths'.

She was diagnosed with polycystic ovary syndrome.

He is suffering from acquired immune deficiency syndrome (AIDS).

He was diagnosed with amyotrophic lateral sclerosis.