The chip can be cooled with liquid nitrogen or even liquid helium, but this requirement complicates the apparatus considerably. 一种是利用液态氮或液态氦来冷却晶片，但这会让仪器变得复杂许多。
They use liquid nitrogen to burn warts off of fingers. 他们使用液氮把手指上的瘊子冷冻掉。
The relation between the start pressure and the consumed amount of liquid nitrogen is studied and the optimum start pressure is obtained. 分析了该冷阱的启动压强和液氮消耗量，得到了最佳的启动压强。
