Hammett's rule

例句：

1. 1.The Hammett's rule is a useful tool for predicting the behavior of molecules in a gas phase.
   哈姆特规则是一种预测气体分子行为的有用工具。
2. 2. The Hammett's rule can be used to estimate the energy of electrons in a molecule.
   哈姆特规则可以用来估计分子中电子的能量。
3. 3.The Hammett's rule has been widely used in the field of quantum chemistry.
   哈姆特规则在量子化学领域得到了广泛应用。