Definition
时速 (shí sù) specifically means 'speed per hour' — it always refers to a rate measured in kilometers or miles per hour, like a vehicle's speed or a speed limit. This distinguishes it from 速度 (sù dù), which is the general word for 'speed' or 'rate' in any unit (e.g., meters per second, pace of work). Use 时速 when the hourly rate matters; otherwise use 速度.
noun
speed (in kilometers per hour)
Easily confused
- 食宿shí sùsound-alikeboard and lodging; room and board
Examples
- 时速。Zhè liàng huǒchē de shí sù shì měi xiǎoshí sān bǎi gōnglǐ.This train's speed is 300 kilometers per hour.
- ，时速。Zài chéngshì lǐ kāichē, shí sù bù néng tài kuài.When driving in the city, the speed cannot be too fast.
- 时速，。Sījī yào zhùyì shí sù, bǎozhèng ānquán.Drivers must pay attention to speed to ensure safety.
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