单位能量间隔中的数目 number per unit energy interval
在一个空间隔的突发中包含的空间隔数目。
Burst_Length: The number of idle periods in a burst of idle periods.
杆状细胞的数目和间隔决定了如何地反射光，因而产生了不同的颜色。
The number and spacing of the rods controls how light reflects which produces different colors.
结果：1．7天和14天高氧组肺组织出现肺泡结构破坏明显、肺泡大小不等、数目较少、局部肺不张、肺间隔明显增厚；
Destroyed alveolars, decreased number of alveoli, local atelectasis and thickened alveoli septum were observed in the hyperoxic-damaged lungs of the 7th and 14th day.
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