Number + 米
米 (mǐ) means meter, the standard unit of length measurement. It is placed after a number to indicate distance or height, such as 15米 (15 meters). In measurement phrases, it often pairs with adjectives like 高 (tall/high).
这棵树大概有三十米高。
Zhè kē shù dàgài yǒu sānshí mǐ gāo.
This tree is about thirty meters tall.
游泳池的深度只有一米五,小孩也可以玩。
Yóuyǒngchí de shēndù zhǐ yǒu yī mǐ wǔ, xiǎohái yě kěyǐ wán.
The swimming pool is only one and a half meters deep — children can play in it too.
我家离地铁站大约八百米,走路十分钟。
Wǒ jiā lí dìtiě zhàn dàyuē bā bǎi mǐ, zǒulù shí fēnzhōng.
My home is about eight hundred meters from the subway station — a ten-minute walk.