cold-blooded
adjective uk/ˌkəʊldˈblʌd.ɪd/ us/ˌkoʊldˈblʌd.ɪd/
（动物）冷血的
Cold-blooded animals can only control their body heat by taking in heat from the outside or by being very active.
Snakes and lizards are cold-blooded animals. 蛇和蜥蜴都是冷血动物。
Compare: warm-blooded
冷酷无情的，残忍的
behaving in a very cruel way with no sympathy for other people
a cold-blooded murder 残忍的谋杀