infrared radiation
/ˌɪnfɹəɹˈɛd ɹˌeɪdɪˈeɪʃən/
n
English · infrared radiation中文 · 红外线辐射Español · radiación infrarrojaFrançais · rayonnement infrarouge
意味：Electromagnetic waves emitted by warm objects; their many uses include heating, medicine, aerial photography and weaponry.