intensity determination

例句：

1. 1. The intensity of the earthquake was determined by seismographs.
   地震的强度通过地震仪来确定。
2. 2. The intensity of the fire was determined by the thickness of the smoke.
   火灾的强度由烟雾的厚度决定。
3. 3. The intensity of the test is determined by the number of participants.
   测试的强度由参与者的数量决定。