1·The cow says "moo-moo."
奶牛“哞哞”叫。
—— 《柯林斯英汉双解大词典》
2·But I forced myself to acknowledge the fact that every time I ate a hamburger, a cow had ceased to breathe and moo and walk around.
但我强迫我自己每当我吃汉堡时要明了这个事实，就是，一只牛已经为此停止呼吸，不能再叫与走路了。
3·A cow is eating. Eating, eating. Moo!
一只牛在吃草，吃啊，吃啊，哞！
4·Moo-cow' is a child's term.
“哞哞牛”是孩子的叫法。