Balmer limit

例句：

1. 1. The Balmer limit isa critical region in the spectrum where absorptionand emission are equal.
   巴勒默极限是光谱中一个关键的区域，吸收和发射相等。
2. 2. In quantum mechanics,the Balmer limit is used to determinethe energy levels of atoms.
   在量子力学中，巴勒默极限被用来确定原子的能量级。
3. 3. The Balmer limitis also known as the "blue shift" or "red shift" depending onthe direction of the absorption.
   巴勒默极限也被称为“蓝移”或“红移”，取决于吸收的方向。