vapour concentration

例句：

1. 1.The vapour concentration in the room was very high, making it difficult to breathe.
   房间里的蒸汽浓度非常高，让人难以呼吸。
2. 2. The vapour concentration of the gas is critical for its use.
   气体的蒸汽浓度对其使用至关重要。
3. 3.The vapour concentration in the air increased significantly after the rain.
   雨后空气中的蒸汽浓度显著增加。