英语语法分析

The non-dispersive infrared method (NDIR) is used to measure CO, CO2 and HC;

使用非扩散红外线（NDIR）光吸收方法分析HC、CO和CO2质量分数；

The multi channel light base on NDIR was applied to analyze varied part of gas in single gaseous chamber.

本文在不分光红外分析法的基础上，应用一种多通道的光路，研究在一个气室中分析多种气体成分的方法。

We think we should take NDIR to analysis the gas because it will be small-size, high-capability with lower cost.

我认为我们应该用无弥散红外线来分析气体。因为这种方法规模小，性能高，成本低。