simple substance的用法和樣例：
例句
- In addition, the syntheses of one-dimensional chalcogen simple substance under hydrothermal conditions are also explored.
另外，對水熱條件下一維硫屬元素單質材料的合成也進行了研究。 - This substance can be reduced to a single chemical and oxygen, by passing an electrical charge through it.
該物質可電解成一種化學單質和氧氣。
