消化学：研究消化系统及其疾病的医学。

Gastroenterology: Medical specialty dealing with digestion and the digestive system.

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橡树的叶子尝起来很臭，因为它们含有丰富的单宁酸，这种化学物质会让很多生物感到不适或难以消化。

The leaves of an oak tree taste foul because they are rich in tannins, a chemical that renders them distasteful or indigestible to many organisms.

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其效力来自咀嚼：咀嚼比随后的消化更容易释放出这些化学物质。

The punch comes with the crunch: Chewing, more so than subsequent digestion, releases these chemicals.

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