一项合约的有效时期或寿命。
但是可能有许多测试的生命长过其有效时期。
But it may have a number of tests that have outlived their usefulness.
但这些同样的材料尽管非常适合庞大的埃特鲁里亚风格，却被佛罗伦萨文艺复兴时期有效地利用，创造出了最精致、最优雅的风格。
But these same materials, which so suited the massive Etruscan style, were effectively used by the Florentine Renaissance to create the most delicate and graceful of styles.
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