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.

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。

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Rapid increase of aerosol optical depth and coarse particle concentration, as well as aerosol neutral or anomalous extinction was observed during dusty periods.

沙尘期间，气溶胶光学厚度显著升高，而尺度上升，粗粒子浓度显著增加，大气气溶胶表现出中性或异常消光特征。

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The electron free flying time is determined by the electron -neutral particle collision frequency.

电子的自由飞行步长由电子与中性粒子的碰撞频率来决定。

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Neutrino astronomy is hard because neutrinos (a type of electrically neutral elementary particle) are rarely absorbed by matter.

ECONOMIST: This year, the Nobel authorities have shown a deft touch

Although the probe would carry no cameras in the classic sense, its onboard instruments would include a low-energy charged particle experiment, a magnetometer, a cosmic ray detector, and an energetic neutral atom detector.

FORBES: Jump-Starting A Mission To Interstellar Space