cryogenics

n [sing v] scientific study or use of very low temperatures 低温学.

crusade, crusader, crush, crush barrier, crushing, crushingly, crust, crustacean, crusty, crutch, crux, cry, cry down, cry for, cry off, cry out, cry-baby, crybaby, crying, cryogenic, crypt, crypt(o)-, cryptic, cryptically, cryptogam, cryptogram, crystal, crystal ball, crystal clear, crystal set, crystal-gazing, crystalline, crystallization, -isation, crystallize, crystallize, crystallise, crystallized, -ised, CSE, CSM, CST, ct,