春秋战国晚期（公元前4世纪）有套有木制胸轧的马的画卷（楚国文物）。

In the late feudal period (4th Century BC) there is pictorial evidence (from the Chinese state of Chu) of a horse with a wooden chest yoke.

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文物：春秋竹弓，弓臂用单根竹材弯曲而成，称为单体弓。

Bamboo bow of the Spring and Autumn Period: the arch was made of a single piece of bamboo, so it was called monomer bow.

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文物：春秋竹弓，弓臂用单根竹材弯曲而成，称为单体弓。

Bamboo bow of the Spring and Autumn Period: the arch was made of a single piece of bamboo, so it was called monomer bow.

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