1·Each pattern stands for a distinct chemical element, and so different sets or patterns of spectral lines mean that the star has a different chemical composition.
每一种样式代表一种不同的化学元素，所以光谱线的不同集合或模式意味着这颗恒星有不同的化学成分。
2·Uranium is a chemical element.
铀是一种化学元素。
3·Radium is a chemical element.
镭是一种化学元素。
4·Radium is a chemical element.
镭和铀是放射性元素。
5·The chemist found a new chemical element.
那位化学家发现了一种新的化学元素。
6·It is the discovery of a new chemical element.
它是一种新化学元素的发现。
7·What is the nature of the new chemical element?
这新的化学元素特性怎样?。
8·Summarize the chemical element of momordica charantia.
对苦瓜的化学成分进行了概述。
9·So they represented this chemical element with a solar symbol.
所以他们用太阳符号来代表这种化学元素。
10·Zinc is a chemical element which is very important to our health.
锌是一种对人体健康很有益处的元素。