十米

The garden is 30 metres long and 20 metres wide.

"园长三十米,宽二十米。"

This new model of drilling machine can bore through solid rock ten metres deep.

台新型钻机能钻透十米厚的坚固岩石。

I'll swim you 50 meters.

我要跟你赛五十米游泳。

Overpumping groundwater for drinking water and irrigation has caused water levels to decline by tens of metres in many regions, forcing people to use low-quality water for drinking.

过度抽取地下水做为饮用水用来灌溉在许多地区已经使水位下降了几十米，迫使人们使用质量较差的水来做为饮水。