as stubborn as a mule
非常执拗或顽固very stubborn
He is as stubborn as a mule.他像骡子一样倔。

A mule is a cross between a mare and a donkey.骡子是母马和公驴的杂交种。
She wore tight trousers and high-heeled mules.她穿着紧身裤和高跟拖鞋。