详细解释:n. 延长, 扩充, 范围, 扩展名
a. 伸缩的
【计】 扩展名, 扩充名
【化】 伸长
【经】 延期
词型变化：
形容词:extensional英语解释：
名词 extension:
a mutually agreed delay in the date set for the completion of a job or payment of a debtact of expanding in scope; making more widely availablethe spreading of something (a belief or practice) into new regions同义词：propagation