There is a road about 20klio meters long called "DeLin avenue" in GuYuan City Ningxia mountainous area;
在宁夏山区固原市，有一条长约20公里公路叫做“德林大道”；
Ren Delin had extended it to long needle problem, who cancelled the limitation (the diameter of the convex domain is less than the distance of the grid of parallel lines).
任德麟作了进一步推广，即取消凸域直径不超过带域间距离这一限制。
Ren Delin had extended it to long needle problem, who cancelled the limitation (the diameter of the convex domain is less than the distance of the grid of parallel lines).
任德麟作了进一步推广，即取消凸域直径不超过带域间距离这一限制。
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