Examples
nǐ你yǒu有gè个sǐ死nǎo jīn脑筋。
你有个死脑筋。
You've got a one-track mind.
现在正是关键的时候了，请不要还那么死脑筋，丝毫不知权变。
Now is the critical moment. Please stop being so stubborn and inflexible, completely unable to adapt flexibility.
她的脑筋转得很快，无论你对她说些什么，她总能巧妙地作出反驳。
She's quick on her feet, so no matter what you say to her, she'll have a witty comeback.