The lense of the camera should be screened from direct sunlight.
应罩上照相机的镜头，使之不受到阳光的直射。
2
The camera lens must be screened from direct sunlight.
照相机的镜头不可受到阳光的直射。
3
The material surface image screened by a CCD camera was processed to calculate the level of material by a computer, and then to control the valve of material container.