标准有效性、内容有效性、构思有效性是有效性评价的三个主要线索。

Three threads of validity assessment look at criterion validity, content validity and construct validity.

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提供从世界卫生组织到其它网站的链接并不表示世界卫生组织认可这些网站，并且世界卫生组织对其内容的有效性或准确性不负任何责任。

The provision of a link from the WHO website to other sites does not indicate endorsement of those sites by WHO, and WHO accepts no responsibility for the validity or accuracy of their content.

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现在，您没有检查正在处理的内容的有效性，而是将256个字节复制到了仅为128个字节的保留堆栈空间内。

Now, without checking the validity of what you're doing, you copy 256 bytes into a stack area reserved at only 128 bytes.

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