adj.(细胞或微生物的培养)生活期有限的;
例句:
His professional career spanned 16 years.
他的职业生涯持续了16年。
Over there is a small stream spanned by a wooden bridge.
那边有一条架着木桥的小溪.
The post can be spanned by one's two hands.
这个柱子有两手的指距那么粗.