Each disaccharide is composed of two monosaccharides.是什么意思？

Each disaccharide is composed of two monosaccharides.

每一种双糖都是由两个多糖组成.

each

adj. 每，各自的；pron. 每个，各自；

例句
They were completely absorbed in each other...
两人彼此倾心。

disaccharide

n. 二糖，双糖；

例句
Cellulase An enzyme that hydrolyzes 1, 4 - glycosidic linkages in cellulose, yielding cellobiose ( a disaccharide ) and glucose.
一种能够水解纤维素中1, 4-糖苷键, 生成纤维二糖 ( 一种二糖 ) 和葡萄糖的酶.

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

composed

adj. 镇静的，沉着的；v. 组成( compose的过去式和过去分词 )，调解，[印刷]排（字），使安定；

例句
A methane molecule is composed of one carbon atom attached to four hydrogens.
甲烷分子由1个碳原子与4个氢原子构成。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我

例句
He has been absent from his desk for two weeks...
他已经有两个星期没有坐在办公桌前了。