《周礼·冬官考工记·筑氏&玉人》
把甬长分为三等分，二等分在上，一等分在下，就在上下两段之际设置旋。
参分其甬长，二在上，一在下，以设其旋。
Divide the length of Yong into three equal parts, with two parts on the top and one part on the bottom, and place the spiral between the upper and lower parts.
<s>[INST] Convert the following English text into Classical Chinese: Divide the length of Yong into three equal parts, with two parts on the top and one part on the bottom, and place the spiral between the upper and lower parts. [/INST] 参分其甬长，二在上，一在下，以设其旋。</s>
Convert the following English text into Classical Chinese: Divide the length of Yong into three equal parts, with two parts on the top and one part on the bottom, and place the spiral between the upper and lower parts.
user
参分其甬长，二在上，一在下，以设其旋。
assistant