Design by Contract, or programming by Contract, is not a new concept in programming, many languages already having such implementations.
契约式设计(或“契约式编程”)并不是编程领域的新概念，许多语言中已经有类似的实现了。
This Contract is made in English and Russian languages in two originals, one of each versions shall be for the Seller and one for the Buyer.
本合同以英语和俄语的形式分别出具两份正本，每一个版本由卖方和买方各保存一份。
The concept of Design by Contract allows you to define some constraints and invariants of your class. Statically typed languages have a primitive version of this.
契约设计这样的概念允许我们在类中定义一些约束和限制。
The contract is made out in English and Chinese languages in quadruplicate, both texts being equally authentic, and each Party shall hold two copies of each text.
英语商务合同中，有些句式是几乎每一份合同都要用到的，这些句式的翻译也往往是约定俗成的。常见的结构如。
This Contract is made out in two original, each copy written in Chinese and English languages, both text being valid.
本合同正文一式两份，分别以中文和英文书写，两种文本具有同等效力。
This Contract is made out in two original, each copy written in Chinese and English languages, both text being valid.
本合同正文一式两份，分别以中文和英文书写，两种文本具有同等效力。
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