oxygen flow meter

例句：

1. 1. The oxygen flow meter is used to measure the amount of oxygen in the air.
   氧气流量计用于测量空气中的氧气含量。
2. 2.The oxygen flow meter was used to monitor the health of the patients during the surgery.
   氧气流量计被用来监测手术过程中病人的健康情况。
3. 3. The oxygen flow meter is essential for ensuring the safety of the workers in the factory.
   氧气流量计对于确保工厂工人的安全至关重要。