ex‧ten‧sion S3 W3 / ɪkstenʃ ə n / 名词

1 making something bigger or longer [可数和不可数名词] the process of making a road, building etc bigger or longer, or the part that is added

extension of

the extension of the Jubilee underground line

2 extra rooms [可数名词] British English another room or rooms which are added to a building

extension to

the planned extension to the National Museum

a loft extension

3 extra time [可数名词，通常单数] an additional period of time allowed for something :

Donald’s been given an extension to finish his thesis.

The pub’s got an extension tonight (= it will stay open longer than usual ) .

4 include/affect more than before [单数形式，不可数] the development of something in order to make it affect more people, situations, areas than before

extension of

the extension of the copyright laws to cover online materials

an extension of the powers of the European Parliament

5 telephone [可数名词]

a) one of many telephone lines connected to a central system in a large building, which all have different numbers :

Can I have extension 316, please?

Do you know Mr Brown’s extension number ?

b) one of the telephones in a house that all have the same number

6 by extension used when you want to mention something that is naturally related to something else :

My primary responsibility is to the pupils, and by extension to the teachers and parents.

7 extensions [复数形式] long pieces of artificial hair that can be attached to your hair to make it look longer

hair extensions

8 computer [可数名词] technical a set of three letters that follow the name of a computer file to show what it is. For example, the extension ‘.doc’ shows that a file is a written document.

9 electric wire [可数名词] British English an extension lead

10 stretch arm/leg [可数和不可数名词] the position of a part of the body when it is stretched, or the process of stretching it

11 university/college [不可数名词] part of a university or college that offers courses to people who are not full-time students