在登录页面上，租户用户输入自己的用户名和密码，可以通过输入显式地提供租户名称，也可以通过url隐式地提供。
In the login page, the tenant user inputs his user name and password with tenant name provided either explicitly by input or implicitly by URL.
表可以通过使用 JOIN 关键字显式地连接，也可以通过使用 WHERE 子句隐式地连接。
Tables can be joined either explicitly, by using the JOIN keyword, or implicitly, by using a WHERE clause.
契约式设计也做了显式的合约定义，而在单元测试中这些更隐式。
Design by contract also makes explicit the contract definition that is more implicit in unit tests.
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