慢速英语:Researchers Find Way to Reduce Methane from Cows

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global - adj. of or related to the world

emit - v. to send gases, light, or energy out into the air

cattle - n. cows, bulls, or steers that are kept on a farm or ranch for meat or milk

belch - v. to let out air from the stomach through the mouth very loudly

greenhouse - n. a structure that protects plants and extends growing seasons