關於馬鞍的一段文字偶俗在素有在看但素給它看沒有...

"The invention of the stirrup occurred relatively late in history, considering the fact that horses were domesticated in approximately 4500 BC, and the earliest forms of the saddle about 800 BC; however, the invention of the solid saddle tree by the Romans circa A.D. 200 may have been a necessary prerequisite;... 顯示更多 "The invention of the stirrup occurred relatively late in history, considering the fact that horses were domesticated in approximately 4500 BC, and the earliest forms of the saddle about 800 BC; however, the invention of the solid saddle tree by the Romans circa A.D. 200 may have been a necessary prerequisite; modern saddle makers working with "treeless" and flexible tree saddle designs have found that without a somewhat solid tree as a base for attaching stirrups, thus distributing pressure over a wide area, the weight of the rider in the stirrups can create abnormal pressure points and make the horse's back sore."
就素這個:
"the invention of the solid saddle tree by the Romans circa A.D. 200 may have been a necessary prerequisite; modern saddle makers working with "treeless" and flexible tree saddle designs have found that without a somewhat solid tree as a base for attaching stirrups,"
歐買尬的,怎麼馬鞍跟"TREE"有關??不只是"樹",還"沒有樹""堅固的樹""有彈性的樹"...有哪位大大先進指導一下吧,拜託!!
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