Stubborn
stubborn /ˈstʌbən/
adj. 顽固的，倔强的，难以去除的
It means that someone is determined to do what he/she wants to and is very unwilling to change his/her mind; or refers to a stain or problem which is difficult to remove or deal with.
它指的是某人下定决心想要去做某事，不愿意改变;或指污渍或问题很难去除或很难处理。
He is a stubborn man and never changes his mind.
他是个很固执的人，从不会改变主意。
My mother has a stubborn cold and coughs day and night these days.
我妈妈最近得了很难治的感冒，日夜咳嗽。
