人身九窍，上窍七，下窍二，上窍为阳，下窍为阴，尽人而知之也。其中阴阳奇偶生成之妙谛，
《内经》未言，兹特补而论之。阳窍反用偶，阴窍反用奇。上窍统为阳，耳目视听，其气清为阳；鼻嗅
口食，其气浊则阴也。耳听无形之声，为上窍阳中之至阳，中虚而形纵，两开相离甚远。目视有形之
色，为上窍阳中之阴，中实而横，两开相离较近。鼻嗅无形之气，为上窍阴中之阳，虚而形纵，虽亦两
窍，外则仍统于一。口食有形之五味，为上窍阴中之阴，中又虚又实，有出有纳，而形横，外虽一窍，
而中仍二。合上窍观之，阳者偏，阴者正，土居中位也；阳者纵，阴者横，纵走气，而横走血，血阴而
气阳也。虽曰七窍，实则八也。阳窍外阳（七数）而内阴（八数），外奇而内偶，阳生于七，成于八也。
生数，阳也；成数，阴也。阳窍用成数，七、八成数也。下窍能生化之前阴，阴中之阳也；外虽一窍而
内实二，阳窍用偶也。后阴但主出浊，为阴中之至阴，内外皆一而已，阴窍用奇也。合下窍观之，虽
曰二窍，暗则三也。阴窍外阴（二数）而内阳（三数），外偶而内奇；阴窍用生数，二、三生数也。上窍
明七，阳也；暗八，阴也。下窍明二，阴也；暗三，阳也。合上下窍而论之，明九，暗十一，十一者，一也；九为老，
一为少，老成而少生也。九为阳数之终，一为阳数之始，始终上下，一阳气之循环也。开窍者运阳气也。妙谛无穷，一
互字而已。但互中之互，最为难识，余尝叹曰∶修身者，是字难，格致者，互字难。
人身有九窍，上窍七个，下窍两个，上窍属阳，下窍属阴，这是人人都知道的道理。其中阴阳、奇数偶数以及生成变化的精妙真谛，《黄帝内经》未曾详述，这里特意补充论述。
上窍统称为阳，但耳目用于视听，其气清轻属于阳；鼻用于嗅气味，口用于进食，其气重浊则属于阴。
耳听无形的声音，是上窍中阳的极致（至阳），中间空虚且形状纵向，两个孔窍分得很开。
目视有形的颜色，是上窍中阳里的阴，中间充实且形状横向，两个孔窍距离较近。
鼻嗅无形的气息，是上窍中阴里的阳，中间空虚且形状纵向，虽然也是两个孔窍，但在外部仍统合为一个整体。
口吃有形的五味食物，是上窍中阴里的阴，中间既虚又实，有进有出，形状横向，外部虽是一个孔窍，但内部仍是两个部分。
综合观察上窍：阳的属性偏向侧面，阴的属性端正居中，如同土居中央之位；阳的属性纵向，阴的属性横向，纵行走向气，横行走向血，血属阴而气属阳。
虽然说有七窍，实际上却是八窍。阳窍外部表现为阳（七这个奇数），内部表现为阴（八这个偶数），外为奇数内为偶数，阳气生于七，成就于八。
下窍中的前阴具有生化功能，是阴中的阳；外部虽然是一个孔窍，但内部实际上是两个，所以阳窍（此处指代前阴的功能特性或归类逻辑，原文意指下窍中具生化功能者）使用偶数。
后阴只主管排出浊物，是阴中的至阴，内外都只有一个孔窍，所以阴窍使用奇数。
综合观察下窍：虽然说有两个孔窍，暗含则是三个。
阴窍外部表现为阴（二这个偶数），内部表现为阳（三这个奇数），外为偶数内为奇数；阴窍使用生数，二和三都是生数。
综合上下窍来论述：明数为九，暗数为十一。十一即为一（数理循环归一）。九是老阳之数，一是少阳之数，老成则少生。
九是阳数的终结，一是阳数的开始，始终与上下，是一阳之气的循环。
The human body has nine orifices: seven upper orifices and two lower orifices. The upper orifices belong to Yang, and the lower orifices belong to Yin; this is known to everyone. However, the profound truth regarding the generation and completion involving Yin-Yang, odd numbers, and even numbers was not explicitly stated in the *Huangdi Neijing* (Yellow Emperor's Inner Canon). Here, it is specifically supplemented and discussed.
Yang orifices paradoxically use even numbers, while Yin orifices paradoxically use odd numbers.
The upper orifices are collectively categorized as Yang. The ears and eyes are used for hearing and seeing; their Qi is clear and thus belongs to Yang. The nose is used for smelling, and the mouth for eating; their Qi is turbid and thus belongs to Yin.
The ear hears formless sounds, representing the utmost Yang within the upper Yang orifices. It is hollow in the middle, vertically shaped, with the two openings far apart.
The eye sees colored forms, representing Yin within the upper Yang orifices. It is solid in the middle, horizontally shaped, with the two openings relatively close together.
The nose smells formless air, representing Yang within the upper Yin orifices. It is hollow and vertically shaped. Although there are two openings, they are externally unified into one.
The mouth consumes the five flavors of food, representing Yin within the upper Yin orifices. It is both hollow and solid internally, having both excretion and intake, and is horizontally shaped. Externally it appears as one orifice, but internally it consists of two parts.
Observing the upper orifices as a whole: Yang is oblique/side-oriented, while Yin is upright/central, akin to Earth occupying the central position. Yang is vertical, and Yin is horizontal. Vertical movement governs Qi, while horizontal movement governs Blood. Blood is Yin, and Qi is Yang.
Although it is said there are seven orifices, there are actually eight. The Yang orifices are external Yang (the number 7, an odd number) and internal Yin (the number 8, an even number); external is odd, internal is even. Yang is born from 7 and completed by 8.
Generation numbers are Yang; completion numbers are Yin. The Yang orifices utilize completion numbers, which are 7 and 8.
The anterior orifice of the lower region possesses the function of generation and transformation, representing Yang within Yin. Although it has one external opening, it actually has two internal structures, thus utilizing an even number.
The posterior orifice is solely responsible for expelling turbidity, representing the utmost Yin within Yin. Both its interior and exterior consist of a single opening, thus utilizing an odd number.
Observing the lower orifices as a whole: although it is said there are two orifices, secretly there are three.
The Yin orifices are external Yin (the number 2, an even number) and internal Yang (the number 3, an odd number); external is even, internal is odd. The Yin orifices utilize generation numbers, which are 2 and 3.
For the upper orifices, the manifest number is 7 (Yang); the hidden number is 8 (Yin).
For the lower orifices, the manifest number is 2 (Yin); the hidden number is 3 (Yang).
Considering both upper and lower orifices together: the manifest total is 9, and the hidden total is 11. Eleven reduces to one. Nine represents the Old Yang, and One represents the Young Yang. When Old is completed, Young is generated.
Nine is the end of the Yang numbers, and One is the beginning of the Yang numbers. Beginning and end, upper and lower, constitute the cycle of Yang Qi.
The function of opening the orifices is to circulate Yang Qi. The profound truths are infinite, ultimately summarized by the character "Hu" (Mutual Interchange/Mutuality).
However, the mutual interchange within mutual interchange is the most difficult to comprehend. I have often sighed: For those cultivating themselves, the character "Shi" (This/Is) is difficult; for those investigating things to extend knowledge, the character "Hu" (Mutual) is difficult.