At a minimum, the existenceof a contract would serve as an authorization check; without a valid contract, the service cannot be invoked.
最低限度,合同的存在将起到授权核查的作用;如果没有有效的合同,将不能调用服务。
3
The existenceof a large population on a limited area is only possible owing to science and technique; education must, therefore, hand on the necessary minimum of these.