(1)He is proud of his blue blood.他因出身名门贵族而骄傲。 (2)Things are looking extremely blue.情况极其不妙。 (3)True blue will never stain.真金不怕火炼。 (4)She ran and ran until she was blue in the face.她跑啊跑啊，累得脸色发青精疲力竭。
