digital l radiation monitor 数字式辐射监测仪
aerial l radiation resistance 天线辐射电阻
natural l background radiation 本底辐射
L the outer layers of space suit protect against harmful radiation from the Sun and bullet-fast particles of space dust called micrometeoroids.
宇航服的外层能够防御太阳辐射和高速微流星体造成的伤害。微流星体是指太空中的微小尘粒。
L Glowing nebulae are named because they give off a dim, red light, as the hydrogen gas in them is heated by radiation from nearby stars.
l有一种星云叫亮星云，它们发出暗淡的红光，这种红光是因为构成星云的氢气受到附近星体的射线激发而发出的光线。
L The clear, plastic helmet also protects against radiation and micrometeoroids.
宇航服的透明头盔，也能够抵御射线和高速太空微粒。
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