To have a cow is to get overly upset about something.

拥有一头牛就是对某事过度沮丧。

To have a cow is to be overly emotional about something.

拥有一头牛就是对某事过于情绪化。

One is: To have a cow or Don't have a cow.

一个是：To have a cow 或 Don't have a cow。

" To have a cow" is an interesting expression; it literally means to give birth to a cow, like a woman gives birth to a child.

“拥有一头母牛” 是一个有趣的表达；它的字面意思是生一头牛， 就像女人生孩子一样。