When making travel plans, work out the maximum amount you can afford to spend.
在做旅行计划时,算一下你最多能承受多少花销。
First is free flow in which the density of traffic is low enough to allow vehicles to travel at the maximum speed allowed.
首先是畅通无阻,交通密度足够低,使得车辆能以最高时速行驶。
The Segway, which has a maximum speed of 12.5mph and can travel around 18 miles between charges, was unveiled by New Hampshire entrepreneur Dean Kamen 2001 and went on sale the following year.
“赛格威”的最高时速为12.5英里(合20公里),充电之后可行驶约18英里(合29公里),2001年,美国新罕布什尔州的企业家迪安·卡门将它公诸于众,第二年开始销售。
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