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光速一秒可以绕地球 7 圈，那为什么到美国的光纤宽带，速度会那么慢？
source link: https://www.v2ex.com/t/520786
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宽带症候群 - @3dwelcome - 只是从理论上去求证，光速一秒绕地球 7 圈，那么沿着赤道跑一圈，就是 1s / 7 = 142ms。国内到美国差不多半个赤道的距离，是不是最理想的情况，海底光缆和配套设备优化到极致，ping
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