elementary substance

• 元素

elementary substance的用法和样例：

例句

1. Oxygen is one of the basic elements of substance.
   氧是物质的基本元素之一。
2. An element is one kind of substance, and its nature can not be changed by any general decomposition method.
   一个元素是一种物质，它的性质不能由任何普通的分解方法而改变。