life-spansˈlaɪfspænzCOCA¹⁰⁷¹⁵⁴BNC⁹⁷²³³⁺⁷ 基本例句 n.寿命原型life-span的复数 Firms tend to be very conservative in their investments, since refineries have decades-long life-spans, during which prices and profits can fluctuate wildly. 企业对于其投资都是很谨慎的，因为炼油厂的运行周期长达数十年，期间价格和利润都会有较大浮动。 ecocn