3 sentences

1. 这辆车超速了。

   zhè liàng chē chāo​sù le.

   The car is exceeding the speed limit.

   Source: Tatoeba

2. 他在高速公路上超速行驶，结果被交警拦下了。

   tā zài gāo​sù gōng​lù shàng chāo​sù xíng​shǐ, jié​guǒ bèi jiāo​jǐng lán​xià le.

   He was speeding on the highway and was stopped by the traffic police.

   Source: Dong Chinese Dictionary

3. 超速离心机在生物化学实验中非常重要。

   chāo​sù lí​xīn​jī zài shēng​wù huà​xué shí​yàn zhōng fēi​cháng zhòng​yào.

   Ultracentrifuges are very important in biochemical experiments.

   Source: Dong Chinese Dictionary