1·Horizontal holes were drilled into the wet soil and liquid nitrogen was pumped in, freezing the water until the tunnel could be dug and cemented.
在湿的土壤中水平的打一些洞，然后泵入液氮对水进行冷冻，直到隧道可以被挖掘和用水泥封住。
2·The U.S. smallpox viruses, which include samples from Britain, Japan and the Netherlands, are stored in liquid nitrogen.
美国的天花病毒样本包括来自英国、日本和荷兰的样本，被存储于液氮中。
3·The alternative is to liquefy the hydrogen at great expense and transport it in road tankers refrigerated with liquid nitrogen.
一个替代的办法是以巨大的代价把氢气液化，并用带液氮冷却的罐车运输。
4·To open the amber, place the sample in liquid nitrogen, where it will freeze and become brittle.
打开琥珀，将标本放入液氮之中，此时它会被冷冻，并变得易碎。
5·How it got here: Scottish chemist and physicist Sir James Dewar invented the vacuum flask Iin 1892 as a way to keep liquid nitrogen from warming up and turning into gas in his lab.
它是如何问世的：1982年苏格兰化学家和物理学家James Dewar爵士发明了保温瓶用以防止实验室中的液氮升温而气化。