1. 不可数名词：伸展；伸长；扩大( of)
2.[U,C]延长；延期；缓期
3. 可数名词：延长部分；扩大部分；增设部分
4. 可数名词：电话分机
词形变化
- 形容词 extensional
- act of stretching or straightening out a flexed limb
- a string of characters beginning with a period and followed by one to three letters; the optional second part of a PC computer filename
- an additional telephone set that is connected to the same telephone line
- an addition that extends a main building
- act of expanding in scope; making more widely available
- an educational opportunity provided by colleges and universities to people who not enrolled as regular students
- a mutually agreed delay in the date set for the completion of a job or payment of a debt
- the ability to raise the working leg high in the air
- the most direct or specific meaning of a word or expression; the class of objects that an expression refers to
- the spreading of something (a belief or practice) into new regions
- amount or degree or range to which something extends
- an addition to the length of something