两个临近像素中心之间的距离叫做像素间隔。
The distance between the centres of the two adjacent pixels is called pixel spacing.
椭圆越扁平，两焦点之间的距离越远，每个焦点离中心的距离也越远。
The flatter the ellipse the farther apart the foci and the farther each focus the center.
两个点之间的距离大约是一黑洞的分离，从我们自己的太阳系距离银河系中心的三分之一。
The distance separating the two black holes is about a third of the distance separating the solar system from the center of our own galaxy.
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