simple substance的用法和样例：
例句
- In addition, the syntheses of one-dimensional chalcogen simple substance under hydrothermal conditions are also explored.
另外，对水热条件下一维硫属元素单质材料的合成也进行了研究。 - This substance can be reduced to a single chemical and oxygen, by passing an electrical charge through it.
该物质可电解成一种化学单质和氧气。
