当你更换镜头的时候，灰尘和其他异物有可以会掉进DSLR的里面。
Dust and other foreign matter can get inside a DSLR when you change lenses.
在高端，可更换镜头提供图像清晰度和可编程类似传统35 mm胶片式单反相机单镜头反光(或SLR)相机。
On the high end, single lens reflex (or SLR) cameras with interchangeable lens offer image sharpness and programmability similar to the traditional 35mm film-type SLR cameras.
为了证明他的观点，他利用相同的照明条件，为一位模特的同一面部表情拍摄了一组肖像照，但是每照一张就更换一种镜头。
To prove his point, he took a series of portraits, using the same model's facial expression and the same lighting - but each time changing the lens.
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