Èr tài shì yóu liǎng gè ānjīsuān zǔchéng de zuì jiǎndān de tài.
A dipeptide is the simplest peptide, made up of two amino acids.
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肽 is a scientific character: the 月 (meat/flesh radical) on the left signals it relates to biological matter, and 太 on the right gives the pronunciation. Peptides are literally biological 'flesh building blocks'.