B2 [ C or U ] the fact of reaching, stretching, or continuing; the act of adding to something in order to make it bigger or longer伸展;延伸
More examples
The planned extension to the motorway near London is going to cost over £4 million.
The boss is refusing to let us have any extension on the deadline for this job.
The new job would involve a significant extension to your current area of responsibility.
The company was granted an extension allowing it to continue using the old trains for a further three months.
After three extensions to his job contract, he was told they would not be renewing it again.
B2 [ C ] any of two or more phones in the same house that share the same number, or any of a number of phones connected to a switchboard in a large building such as an office(共享一个号码的)电话分机;(号码不同的)电话分机
[ C ] the last part of the name of a computer file, which comes after a (.) and shows what type of file it is扩展名(电脑文件名的最后一部分,用于区分文件种类)
also hair extension [ C usually plural ] a long piece of hair that is added to a person's own hair in order to make the hair longer(为创造长发效果而织入头发的)一段假发
[ C ] UK US addition a new part added to a house or other building扩建部分
intended to support students' learning by making them try different or more difficult things in addition to their basic work(学生作业)延展性的,难度更高的,范围更广的
US UK extramural offered by a university to people who are not studying for a degree there (尤指学院或大学)对校外学生提供课程的;为非在校生而设的
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