life span
名词 n.
英文释义
名词 n.
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Alternative spelling of lifespan.
— The working life span of a passenger carriage, on average, is between 30 and 35 years, so a steady replacement takes place quite naturally. The life span of a station, however, cannot be so easily reckoned, for it depends largely on the rehabilitation and upkeep of the existing structures.
词形变化
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数据来源: Wiktionary