keep your hair on 冷静点，淡定点，别发脾气 We use this expression to tell someone to not be angry or upset, which we think is unnecessary. 我们用这个表达告诉某人不要生气或难过，因为我们认为这没必要。 Keep your hair on, Mary. I wasn't saying that you should do anything dangerous. 冷静点，玛丽。我没有说要你去做危险的事。 Keep your hair on, Mum. You can hardly see the damage. 冷静点，妈妈。这东西上几乎看不出有什么损坏。