无论使用哪些工具，都必须确保作为创建和维护进程一部分的这种有效性。
Whatever tools are used must assure this validity as part of the creation and maintenance process.
这些监管措施强调需要建立和维护公司责任制度，并且定期评估其有效性。
These regulatory ACTS stress the need to establish and maintain corporate accountability as well as periodically assess its effectiveness.
这个版本对数据进行缓存而不是重新加载，很大程度上改善了函数的有效性，但这会需要更多的维护费用。
This version greatly improved the efficiency of the function, by caching data rather than reloading it, but it did so at the expense of maintainability.
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