反过来说，你可以用慢速快门来补偿暗光条件。
Conversely, you might use a slow shutter speed to compensate for low light conditions-the longer the hole is open, the more light gets in, right?
慢速快门也会使支持这张照片的各种元素发挥作用：如那黄昏蓝色的天空和对岸的点点灯光。
The slow shutter also makes the supporting elements work: the blue in the dusk sky, the lights on the opposite shore.
你使用大光圈以及慢速快门所得到的光和你使用小光圈以及高速快门得到的光是一样多的。
You get the same amount of light with a large aperture and a fast shutter speed as you do with a small aperture and a slow shutter speed.
但是这里一样有个缺点，那就是使用慢速快门时，如果你或者你的被摄主题有任何移动的话，你的照片中就会出现动态的模糊。
With a slow shutter speed it's more likely that you or your subject is going to move while the shutter is open, causing motion blur in your photo.
现在你明白拖动快门是什么意思了吧，拖着快门放慢速度。
So now you know what "dragging the shutter" means... you have dragged it down to slow speed shooting.
现在你明白拖动快门是什么意思了吧，拖着快门放慢速度。
So now you know what "dragging the shutter" means... you have dragged it down to slow speed shooting.
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