safety brake是什么意思 safety brake怎么读
safety brake的用法和样例
- Originally it was the safety valve for a hydraulic plant.
它最早是一家水电厂的安全闸阀。 - The safety gates at the railroad crossing are lowering.
铁路交叉路口的安全闸正在放下来。 - Originally it was the safety valve for a hydraulic plant.
它最早是一家水电厂的安全闸阀。 - The safety gates at the railroad crossing are lowering.
铁路交叉路口的安全闸正在放下来。
展开更多
