关于厌食的起因存在颇多争论。The causes of anorexia are much debated.最新研究使人们进一步了解了这种疾病的起因.Recent research has cast new light on the causes of the disease.消防队员对这场火灾的起因困惑不解.The firemen were in a puzzle about the cause of the fire....
All colour fades— especially under the impact of direct sunlight.所有颜色都会褪色——尤其是在阳光直射下。You'll need to be able to project two images onto the screen as the new one fades in and the old image fades out.你得能将两个图像投射到屏幕上，让新...