Aperture sizes are expressed in "f-stops."
光圈的大小用“f”来代表。
All of this is a lot to remember. Juggling f-stops, shutter speeds, and ISO values in your head while trying to compose a shot can be tough, especially for beginners.
太多参数需要记住，尤其对于初学者来说，相反的f值，快门速度，以及IS O值，在准备拍摄一张照片的时候这些参数实在太过复杂。
Just like with f-stops, there is a mathematical relationship between different shutter speeds-each shutter speed stays open half as long as the one above it, or twice as long the one below it.
就和f值一样，这一组数字也是一个数列关系，每一档快门速度都是比上一档快一倍的时间，或者是慢一半的时间。
The fermentation process stops when there is no F) longer any sugar to transform.
直到所有的糖全部转化完毕，发酵的过程才会停止。
On an early tour of the White House residence, Obama stops outside the State Dining Room to consider Aaron Shikler's famous portrait of John F. Kennedy.
早日参观白宫官邸，奥巴马停止国之外餐厅考虑亚伦Shikler著名的画像约翰肯尼迪。
This difference is due to our camera Settings. I used a much slower shutter speed, and a slightly wider f-stop. With this, I allowed nearly 3 stops MORE ambient light in. And it shows.
两张照片的不同在于拍摄时设置的不同，我使用的更低的快门速度和更大的光圈，因此我几乎增加了3级的环境光的曝光，因此我的照片看起来更好一些。
This difference is due to our camera Settings. I used a much slower shutter speed, and a slightly wider f-stop. With this, I allowed nearly 3 stops MORE ambient light in. And it shows.
两张照片的不同在于拍摄时设置的不同，我使用的更低的快门速度和更大的光圈，因此我几乎增加了3级的环境光的曝光，因此我的照片看起来更好一些。
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