simplex air gauge

例句：

1. 1. The simplexair gauge is used to measure the amountof oxygen in the cabin during a flight.
   单程空气计用于测量飞行期间客舱内氧气的量。
2. 2. The pilotcarefully checked the simplex air gauge beforetakeoff to ensure there was enough oxygenfor the passengers.
   飞行员在起飞前仔细检查了单程空气计，以确保乘客有足够的氧气。
3. 3. During the emergency landing,the simplex air gauge showed that theoxygen levels were dropping rapidly.
   在紧急降落时，单程空气计显示氧气水平正在迅速下降。