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1·Moo-cow' is a child's term.

“哞哞牛”是孩子的叫法。

2·The cow says moo-moo.

奶牛“哞哞”叫。《柯林斯英汉双解大词典》

3·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。

4·A cow is eating. Eating, eating. Moo!

一只牛在吃草，吃啊，吃啊，哞！