平均有效性

mean availability的用法和样例：

例句

Numerical experiments show the availability of new methods.数值算例显示了新方法的有效性。
Capital availability is an economic prop for trade and credit reliability is the guarantee to fulfill the contract.资金的有效性是进行贸易的经济后盾，信用的可靠度是履行合同的保证。

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