An explicit data value that appears as part of the program is called a constant.
作为程序的一部分，具有明确的数值称之为常量。
Explicit case analysis on the value of an attribute is often an error.
对属性值的显示的分情况分析常常是错误的。
To have predictive value, information need not be in the form of an explicit forecast.
资料要具有预测价值，不一定非要采取明确的预测形式。
Indicates if an explicit nil value can be assigned to the element.
指示是否可以为元素赋予显式零值。
Indicates if an explicit nil value can be assigned to the element.
指示是否可以为元素赋予显式零值。
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