• 1. Vertical column density: 垂直柱浓度
• 2. NO2 vertical column density: NO2垂直柱密度

• 1.It requires a certain degree of fence, a certain density (refers to the vertical column), but also a certain intensity.
  它要求护栏有一定的高度，一定的密度(指竖栏)，还要有一定的强度。
  dict.yoduao.com

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