It expounds three series of relations which are important for the understanding of the thoughts of Chinese sages of the past: 1) the relation between the wisdom of life and the knowledge of experience; 2) the relation between the expressible character of thought and the inexpressible character of thought; 3) the relation between the personal practice and the realm of spirit.
作者认为，理解中国先圣的思想，应当注意三个问题：一、生命智慧与经验知识；二、不可言说与可以言说；三、个性体验与心灵境界。
Ten blue tickets equalled a red one, and could be exchanged for it;
十张蓝色票等于一张红色票，也可以互换。
essential equality and interchangeability.
价值相等，可以互换。
the quality of being transferable or exchangeable.
可以转让或互换的特性。
we can either do each other a lot of good, or we can do each other a lot of harm.
咱们两家可以互相帮助，也可以互相拆台。
Perhaps it is fish for vegetables, or meat for grain.
这可能是以鱼易菜，也可能是以肉换粮。
and that energy and mass are equal and interchangeable.
能量和质量是等值的并可以互换。
Phenotype and niche are exchangeable notions.
表型与小生境是可以互相替换的概念。
True synonymsare entirely interchangeable (with one another).
真正的同义词是完全可以（彼此）互换的.
All these energies may be interconverted without loss.
各种能量可以无损耗地互相转换。
A two-item newsboy inventory problem with substitutability;
两种产品可以互相替换的Newsboy存贮问题
The Interchangeability Between Being and Existence;
论“是”与“在”的可互换性——以波埃修斯为例
Having such a close similarity or resemblance as to be essentially equal or interchangeable.
可互换的十分类似或相象以至于本质上相等的或能互换的
Reciprocal judgment matrix and fuzzy complementary judgment matrix can tansform each other.
互反型判断矩阵与互补型判断矩阵可以相互转换.
Metering ports and body plugs may be interchanged for improved accessibility.
测量端口和阀体塞可以互换，以方便接近。
The pals may even visit as well as write letters.
笔友们甚至也可以跟相互写信一样相互走访。
This list also can be found on the Internet.
这页清单也可以在互联网上查到。
We can discuss state affairs or exchange ideas on certain questions first
可以共商国是,也可以就一些问题交换意见
Besides, "things"can be replaced.
再说，东西即便坏了，也是可以换新的嘛。