(N. Amer. informal)become angry, excited, or agitated
(北美，非正式)生气；激动；焦虑
don't have a cow—it's no big deal.
别着急——没什么大不了。
(informal)for an indefinitely long time
(非正式)长时间地；没完没了地
those two could talk till the cows came home.
这两个人可以没完没了地聊下去。
For a long time; indefinitely
长时间地；无限期地
The guests stayed till the cows came home.
客人们作长时间的逗留