1)expansion shell type heater,膨胀壳式加热器2)popping,(加热)使膨胀3)high pressure thermal expansion SF_6 circuit breakers,高压热膨胀式SF6断路器4)cladding expansion detector,包壳膨胀探测器5)Irons expands when it is heated,铁加热时就膨胀。6)compensating line,膨胀伸缩弯头，热膨胀补偿器，膨胀节
用法和例句
Comparison and analysis are made on principle feature of arc chamber and structural characteristics of operating mechanism in each generation for high pressure thermal expansion SF_6 circuit breakers.