The mean free path is calculated by the mean distance between the centers of your regions.

平均自由路径是由你的区域的中心之间的平均距离计算。

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The distance between two centers of bottom pinch roll and mandrel;

下夹送辊中心和卷筒中心的相互位置；

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The effects of distance between centers, beam waist, refractive-index and wavelength on axial radiation force are discussed.

讨论了离心距对纵向辐射力的影响，也讨论了束腰半径、介质折射率和波长对纵向辐射力的影响。

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For example, the distance between the centers of two black holes in galaxy clusters distant from each other and the gap between cell walls in a living organism differ on a vast scale, despite their sharing of common structures at the atomic level.

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But the truth is that during the late 20th century, the distance between these true believers and the centers of state power has not been very great.

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