a chemical element

• 一种化学元素

a chemical element的用法和样例：

例句

1. An element such as carbon has several allotropic forms.
   一种化学元素具有几种同素异形体，比如碳元素。
2. Each of the chemical elements that makes up the objects radiates at its own characteristic wavelength.
   构成这些天体的每一种化学元素都会以它们特有的波长发出辐射。