七宫涟先生您好，
我在阁下主导翻译的《克苏鲁的呼唤第七版调查员手册》（V1.3.0 2015/12/2）的「C 兼容《日本秘史》的职业」部分看到如下内容：
相扑力士
选择条件:SIZ80 以上，且 STR70 以上
使用摔跤手 / 拳击手模板，然后做以下修改:
SIZ+2D6。你的 SIZ 可以超过 99。
但是在《日本秘史》（1-56882-156-5，2392，Jan. 2005）原文中关于相扑力士职业的描述只找到了如下内容：
SUMÔ—MEETING WITH BLOWS
Weapons: none
Reqired Skills: Grapple, Headbutt
Sumô is a two thousand-year-old form of wrestling considered the national sport of Japan. The object of the sport is for a wrestler to force his opponent out of the center of an elevated ring of cement-hard clay, the dôyo, or to cause him to touch the surface of the ring with any part of his body other than the soles of his feet.
The wrestlers may spend up to the first four minutes in a ritual of stamping feet, squatting, puffing, glowering, and tossing salt in the air. Despite the posturing, ring decorum and sportsmanship are paramount. The actual bout takes only a matter of seconds to resolve.
Deciding who has stepped out or touched the ground first is extremely difficult and requires the close attention of the referee (gyoji), dressed in a court costume of a fourteenth century nobleman. The gyoji stands in the dôyo with the two wrestlers and official
judges, shimpan, sit around the ring at floor level.
The Japan Sumô Association, the governing body of professional sumô, officially lists seventy winning moves, which are composed of throws, trips, lifts, thrusts, shoves and pulls. Of these seventy moves, forty are considered “classic” techniques but the actual number used in the average bout is around twenty or so. ☯
PLAYING A SUMÔ INVESTIGATOR
If you choose an investigator to be a professional sumô wrestler, it is suggested that the character be at least SIZ 16 and STR 14. These are very big and powerful people, even by Western standards.
A retired sumô wrestler can not have a chomagé, and to keep one is an offense to the Sumô Association. Sumô also do not wear Western clothes during their careers, only kimono. After retirement, rebellious ex-sumô will wear specially tailored three piece suits.
想请问一下「SIZ+2D6」这项操作的出处？另外一个很好奇的地方是，《日本秘史》作为一个六版扩展是如何折算出七版中的2D6属性值的？
