提起斗 ,一般对外拽部分谈之甚详 ,对里拽却语焉不详 ,尤其是角科。固然里拽相对外拽来说比较简单 ,但是角科里拽部分 ,因为既有斜翘、斜昂之后尾 ,又在它们的挑头上出里连头合角瓜、万、厢(以下分别简称为合角瓜、万、厢 ) ,还可能与正侧两面相邻之平身科里拽诸相碰 , Mention bucket bucket, the general part of the external drag on a very detailed talk on the pull but did not elaborate, especially the angle of the Branch. Although it is relatively easy to pull the relative drag, but the corner cut in part, because both oblique tilt, tilt after the tail, but also in their head out on the first joint melon, Wan, Xiang  (the following respectively Referred to as the joint melon, million, carriages), but also may be with both sides of the adjacent side of the flat-body co-pull all the clash,