今天我们要学的词是 culprit. [ˈkʌlprɪt]

culprit 的意思是罪魁祸首。（名词） 

In a tweet about the attacks on oil processing centers in Saudi Arabia, U.S. President Donald Trump said, "There is reason to believe we know the culprit," but he refrained from directly blaming Iran at the time. 

美国总统特朗普在推文中提到对沙特阿拉伯石油提炼中心的袭击时说，“有理由相信我们知道谁是罪魁祸首”，但他当时没有直接谴责伊朗。

Heating consumes more than one third of all energy used today around the world and, some say, is the biggest energy culprit contributing to greenhouse gas emissions and to needless energy waste. 

供暖消耗的能源占全球目前能源消耗的三分之一以上，有人认为这是导致温室气体排放和不必要的能源浪费的最大罪魁祸首。