He is exactly in the state of 'A frog in a well does not know the vast ocean.'

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

He underwent surgery on the depressor septi nasi.

The single point of red in the sea of green in the park was her red dress.

She was diagnosed with polycystic ovary syndrome.

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

He was diagnosed with amyotrophic lateral sclerosis.

He contracted severe invasive streptococcal disease and underwent emergency surgery.