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。
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。
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