Objects have no inherent constraints, so explicit coding is required to implement the data validation.

对象没有固有的约束，因此要实现数据验证，必须进行显式编码。

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Explicit means that the type of concepts used, and the constraints on their use are explicitly defined.

显式意味着所使用的概念的类型，和使用它们的约束是显式定义的。

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An important advantage of model predictive control (MPC) is its ability to cope with constraints on controls and states in an explicit and optimal way.

模型预测控制的一个主要优点是能显式并优化处理控制量和状态量的约束。

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To prevent their abuse, Hamilton explained why the Framers believed direct taxes required explicit constitutional constraints, in addition to the general restraining nature of a constitutional arrangement of limiting government solely to delegated powers.

FORBES: The Case Against Direct Taxation: Part One

Here the fund was pretty explicit - the Treasury should buy private bonds to help ease the credit constraints on UK businesses (something Mr Osborne and even Chancellor Darling talked about - but has still not happened).

BBC: IMF: 'Great policies - shame about the economy'