单词	lifespan
释义	lifespan /ˈlʌɪfspan / noun The length of time for which a person or animal lives or a thing functions: the human lifespan... As humans lengthened lifespans with better nutrition and hunting skills, childhood also lengthened. They are slow-breeding and long-lived animals, achieving lifespans of 70 years or so. I suggested that extending human lifespans might lead to extended creativity.
随便看	be run off one's feet be rushed (or run) off one's feet Berwickshire Berwick-upon-Tweed Berwyn beryl berylliosis beryllium Berzelius, Jöns Jakob Bes Besant, Annie Besançon be saved by the bell Beschloss, Michael beseech beseecher beseechingly be seeing double be seeing things beseem beset be set fair be set in concrete besetting sin be shitting bricks

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