This is the 6568th most frequent Chinese word.
时速
"时速" means "speed per hour" or "hourly speed."
In this sentence, '时速' refers to the maximum speed a vehicle can achieve, expressed in kilometers per hour.
这辆汽车的时速可以达到每小时120公里。
The speed of this car can reach 120 kilometers per hour.
Here, '时速' is used as a general term to describe velocity measurements for vehicles.
时速是衡量交通工具行驶速度的重要指标。
Speed is an important metric for measuring the velocity of a vehicle.
In this sentence, '时速' indicates the speed of the moving train, which can vary due to external factors.