速度 sù dù speed; rate; velocity; (music) tempo Example sentences 你应该以安全速度驾驶。 nǐ yīnggāi yǐ ānquán sùdù jiàshǐ. You should drive at a safe speed 这种火车从来不改变速度,一直都是一样的。 zhèzhǒng huǒchē cónglái bù gǎibiàn sùdù, yīzhí dōushì yīyàng de. This type of train has never changed speed, it has always been the same 他百米跑步的速度像火箭一样快。 tā bǎi mǐ pǎobù de sùdù xiàng huǒjiàn yīyàng kuài. He runs 100 meters as fast as a rocket!