chemical change
When two or more elements combine and form a compound, a chemical change takes place.
当两种或两种以上的元素结合形成化合物时, 发生化学变化。
—— 给力词典精选This chemical change can be expressed by an equation.
我们可用反应式表示这种化学变化。
—— 辞典例句These are physical changes while those are chemical changes.
这些是物理变化而那些是化学变化。
—— 辞典例句These modifications include the chemical alternation of the bases.
这种修饰作用包括碱基的化学变化。
—— 辞典例句Microorganisms are the agents that bring about the chemical change.
微生物是引起化学变化的作用者。
—— 辞典例句