Meaning of jiǎn sù:
jiǎn sù
减速
Verb
to reduce speed; to slow down
Zài gāosù gōnglù shàng, wǒmen yīnggāi jiǎnsù, yīnwèi qiánmiàn yǒu jiāotōng yōngdǔ.
在高速公路上,我们应该减速,因为前面有交通拥堵。
On the highway, we should reduce speed because there is traffic congestion ahead.