关节间隙宽度呈左右、上下对称一致；
比较术前术后椎体高度和椎间隙宽度变化。
The altitude and width of spinal fracture were compared during treatment.
当间隙宽度比化合物释放的远红外波长更短时，光子不会被反射，而直接进入芯片中。
When the width of the gap is smaller than the wavelength of the infrared radiation coming off the alloy, the photons are not internally reflected, but continue to travel into the cell.
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