Heat makes a metal expand and cold causes it to contract., Overflow pipes allow extra water to flow out of the tanks., The valve on the oil well prevents the oil from exploding., These powerful pumps make the water rise 30m up the hill., These fire extinguishers stops electtrical fires from spreading., Show your ID card and the guard will let you enter the factory.,

Simple present

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？