单词：void value
void value的用法和样例：
例句
- Theory without practical use is of no value.未经实践检验的理论是没有价值的。
- I set a high value on his advice.我认为他的忠告很有价值。
- A null value in the system is an empty object that has no value.系统中的空值是没有值的空对象。
- You can use a zero-length string to indicate that you know no value exists for a field.可以使用零长度字符串来表明您知道该字段没有值。
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