grunting ['grʌntɪŋ]

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附加级

咕哝的，呼噜的

He pulled harder on the rope, grunting with the effort. 他边用力边哼声，使出更大的力气拉绳子。
Pigs were grunting and squealing in the yard. 猪在院子里哼哼地叫个不停。