Every substance, no matter what it is, is composed of very small particles called molecules.

各种物质，不论它是什么，都是由一些称为分子的很小的粒子构成的。

《新英汉大辞典》

Around 15% of our diet is composed of protein.

我们的饮食中大约有15%的蛋白质。

《牛津词典》

A symphony orchestra is composed of a variety of brass, woodwind, percussion and stringed instruments.

交响乐队是由各种各样的铜管乐器、木管乐器、打击乐器和弦乐器组成的。

youdao

And this ship,that we are in, is full of humanitarian aid materials composed of medical,medicine, construction material and very,very much essential needs for Gazan people.

VOA: standard.2010.05.28

These are the planks of his model, that matter is composed of atoms that are indivisible and indestructible.

这些是，他的模型的一些内容，物质是有原子组成的,不可分割且不可毁灭的。

麻省理工公开课 - 固态化学导论课程节选

And "Dog" Is also a morpheme, but not always because there are single morphemes and then there are words that are composed of many morphemes.

狗"也是一个语素,但词和语素并不总是相同,因为语素是独立的,但词却可以由很多语素组成

耶鲁公开课 - 心理学导论课程节选

Technically, it is composed of seven words: do, you, know, what, I, am, and saying.

CNN: LOL isn't funny anymore

The efficient frontier is composed of investments with the highest return and the lowest volatility.

FORBES: The Efficient Frontier

Louis is composed of lots of little towns with their own governments, mostly non-partisan.

NPR: Missouri Voters Have a History of Picking Presidents