英语语法分析

The tannins are part of the defense mechanism that is essential to longevity.

单宁酸是防御机制的一部分，对长寿至关重要。

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.

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。

It is show that the complexes of galloyl type hydrolysable tannins with aluminum are formed.

结果表明，没食子酰基型可水解单宁与铝形成了配合物。