“中性氦”是天文学专有名词。来自中国天文学名词审定委员会审定发布的天文学专有名词中文译名，词条译名和中英文解释数据版权由天文学名词委所有。
光线的发射处越远，年龄越大，类星体的光谱会缺失，因为某些波长的光线会被中性氦及氦离子或带电粒子吸收。
Light emitted from farther away, and thus older, quasars lacked this wavelength, because the light was getting absorbed by neutral helium as well as helium with a single ion-or charged particle.
中性束注入系统要求有洁净的动态高真空环境，大抽速液氦冷凝泵是满足此要求的理想真空获得设备。
The Neutral Beam Injection (NBI) system requires a clean high vacuum environment. The liquid helium cryocondensation pump with high pumping speed is an ideal vacuum obtain device.
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