adj.[生](細胞或微生物的培養(yǎng))生活期有限的

動詞span的過去式及過去分詞形式.

A bridge spanned the stream. 一座橋橫跨這條河流。

Emily is a Londoner born and bred and, for a woman some years past the allotted span, of a truly remarkable vigour and alertness. 埃米莉生在倫敦長在倫敦，雖已年逾古稀，但實在令人驚訝的是，她仍精力充沛，耳聰目明。

The river Thames is spanned by many bridges. 泰晤士河上有很多橋。

His life had almost completed its span. 他的生命幾已到盡頭。