noun 下载 🔗分享 牛蛙 Any of various frogs having a croak that resembles the bellow of a cow or bull. Examples : "We heard the loud, booming croaks of bullfrogs coming from the pond. " 我们听到池塘里传来牛蛙洪亮而低沉的叫声。 animal sound nature biology organism environment 与AI对话词汇游戏阅读练习