【电学】防止窒息，变换器，静态的，电动机械的机电的

preventive

preventive

the Chinese Academy of Preventive Medicine

preventive orthodontics【口腔】

preventive vaccination

rust-inhibiting lubricant【机】;rust preventive lubricating oil【机】

counterplot【科技】;precautionary measure【科技】;preventive measure【科技】

rust preventive