Meaning of gāo sù:
gāo sù
高速
Adjective
high speed
Wǒmen zài Zhōngguó chéngzuòle gāosù lièchē.
我们在中国乘坐了高速列车。
We took the high-speed train in China.
Noun
expressway (abbr. for 高速公路[gao1su4 gong1lu4])
Wǒmen kāichē chuānguòle nà tiáo xīn de gāosù gōnglù.
我们开车穿过了那条新的高速公路。
We drove across the new expressway.