oxygen concentration

• 氧浓度

oxygen concentration的用法和样例：

例句

1. The reaction rate is limited by the concentration gradient of oxygen in the sample.
   反应速率受试样中氧浓度梯度的限制。
2. At low oxygen concentrations, unconsciousness and death may occur in seconds and without warning.
   在低氧浓度情况下，意识不清和死亡会在几秒钟内发生，而且没有警告。