formula ·noun (RULE)

Definition: a set of letters, numbers, or symbols that are used to express a mathematical or scientific rule Level: C1

理解这个数学公式对解决问题至关重要。

Understanding this mathematical ___formula is essential for solving the problem.

导师解释了不同的科学公式是如何在研究中进行应用的。

The instructor explained how different scientific ___formulae are applied in research.

水的化学式是H₂O。

The chemical ___formula for water is H₂O.