如果我从100米的楼上跳下去，无重量时间大概是4。5秒，忽略空气阻力不计。
If I jump from a tower which is 100 meters high I will be weightless for 4.5 seconds ignoring air drag.
对密度大的货物空气阻力可忽略不计。
The air resistance may be overlooked if the load density is large.
对密度大的货物空气阻力可忽略不计。
The air resistance may be overlooked if the load density is large.
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