Sometimes they give you the speed in miles per hour, kilometers per year, pounds per square foot.
有时候速度的单位是英里/小时,千米/年,英磅/平方米
Soldiers were expected to be able travel thirty kilometers per day, in full pack.
士兵一天可以行进30千米,在全副装备的情况下。
They used even a horseback relay that could go a hundred kilometers a day.
采用了马背接力的形式,一日可以行进100千米。
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