The stick is seventy centimeters long.
这根棍子长七十厘米。
A piece of wood was 40 centimeters long.
一块木头有40厘米长。
Just say that a finger is 4 centimeters long.
一个手指指节是四厘米长。
The base line of this triangle is 20 centimeters long.
这个三角形，底边的长度是20厘米。
The base line of this triangle is 20 centimeters long.
这个三角形，底边的长度是20厘米。
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