常见例句双语例句A nail for fixing the foil in position has a spherical shaped head and in its concavity merges with a saw-tooth barbed pin with a radius.一个固定薄膜位置的钉子具有一个球面形的头部并用一个冲制的圆段过度到锯齿状设置的杆部上。gongye168.com 返回 position saw-tooth