夜天辐射 [天] night sky radiation

天空辐射 [气象] Sky radiation

天线辐射电阻 antenna radiation resistance ; aerial radiation resistance

天线辐射图 antenna pattern ; [电讯] antenna radiation pattern

全向辐射天线 omnidirectional aerial ; [电讯] omnidirectional antenna ; omni aerial

辐射天线 active antenna ; radiating antenna ; impulse radiat ing ant enna ; active antenna radiating antenna

天空热背景辐射 celestial thermal background ; celestial thermal background radiation

天气向下辐射 atmospheric counter radiation

天然辐射 [核] natural radiation ; natural exposure ; natural fallout