Translation of "Km²" in Chinese

In towns, speed is limited to 50 km/h.

在市区内，数度被限制在每小时五十公里以内。

The Yangtze, at 6,380 km, is Asia's longest river.

长江是亚洲的最长江，6380公里。

Tom biked 30 km to the store to buy strawberries for his pregnant wife.

汤姆为他怀孕的妻子骑行30千米到商店买草莓。