The chemist made a vacuum in the bell jar when he exhausted the air from it.
化学家抽走钟形瓶内的空气，使其成为真空。
2
Three bell laboratories scientists invented this device, which was faster, smaller, more reliable and consumed less energy than vacuum - tube technology.
贝尔实验室的三位科学家发明了这项速度快、体积小、更加可靠，并且比真空管大大节能的新技术。
3
Three Bell Laboratories scientists invented this device, which was faster, smaller, more reliable and consumed less energy than vacuum-tube technology.