快车速度英语怎么说

"快车速度"的英文表达是"high-speed"或者"fast speed"。
"High-speed"一词来源于英语单词"high"和"speed"的结合，"high"的意思是"高的"，"speed"的意思是"速度"。因此，"high-speed"就表示"速度很快"的意思。
"Fast speed"同理，"fast"的意思是"快的"，"speed"的意思是"速度"，因此"fast speed"也表示"速度很快"的意思。
下面是一些使用"high-speed"或"fast speed"的英文例句及其中文翻译：
The train was traveling at high-speed. (这列火车以很快的速度行驶。)
The car was going at a fast speed when it crashed. (汽车在发生事故时以很快的速度行驶。)
The high-speed train can reach speeds of up to 300 km/h. (这列高速火车的最高时速可达300公里/小时。)
The fast speed at which the plane was traveling caused it to crash. (飞机以很快的速度行驶导致坠毁。)