Examples
fēi飞jī机zài在sān三qiān mǐ千米de的gāo kōng高空fēi飞xíng行。
飞机在三千米的高空飞行。
The plane flew at an altitude of 3,000 meters.
我的城市离首都五十千米。
My city is fifty kilometres from the capital.
汤姆为他怀孕的妻子骑行30千米到商店买草莓。
Tom biked 30 km to the store to buy strawberries for his pregnant wife.