light absorption line

例句：

1. 1.The absorption line of the gas is at a certain temperature.
   该气体的光吸收线在某一温度下。
2. 2.The absorption line in the spectrum is used to determine the type of light.
   光谱中的吸收线用于确定光的类型。
3. 3. The absorption line was shifted due to changes in pressure.
   由于压力的变化，吸收线发生了偏移。