凹圆灰缝,半圆凹缝;
There was a kind of peculiar bronze chariot and horse fittings in Zhou dynasty, its shape was like the head of the axle-pin, but no keyed joint.
两周时期有一种形制比较特殊的铜车马器,形似车辖的辖首,却没有辖键。
on the axle-pins without keyed joint of zhou dynasty
略谈两周时期无键车辖
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