We define average velocity as the position at time four seconds minus the position at time zero, 4 divided by four.

我们定义平均速度，是四秒时的位置，减去0秒时的位置，除以。

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The geographic use of time began during the British Empire with the world divided by latitude and longitude, with zero degrees longitude running through the observatory at Greenwich, in London.

地理时间的使用始于大英帝国时期，当时用纬线和经线划分世界，零度经线通过伦敦的格林尼治天文台。

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The geographic use of time began during the British Empire with the world divided by latitude and longitude, with zero degrees longitude running through the observatory at Greenwich, in London.

地理时间的使用始于大英帝国时期，当时用纬线和经线划分世界，零度经线通过伦敦的格林尼治天文台。

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