冷血马，欧洲重挽马品种的统称，由史前的丛林马演变而来。
Coldblood: the name used to describe the heavy European breeds of horse descended from the prehistoric forest horse.
上山时，马用力拉拽着马车的挽绳。
那匹在左首拉边套的马低垂着头，时而轻轻拉一下挽索。
The left trace-horse, arching his head, pulled in jerks at his traces.
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