span /spæn/ n. ［c］1.一段时间：a short attention (interest, memory) span 短时间的注意力(兴趣，记忆)；a short span of three years 短短的三年时间 The span of human life is short. 人生是短暂的。［考句］According to the American federal government, residents of Hawaii have the longest life span: 77.2 years.根据美国联邦政府统计，夏威夷居民的寿命最长，平均达77.2岁。2. 跨距，跨度：a bridge of four spans 四孔桥；the span of the crane 起重机臂的伸距