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（房屋的）扩建部分
An extension is a new room or building which is added to an existing building or group of buildings.
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（公路、铁路等的）延长线
An extension is a new section of a road or rail line that is added to an existing road or line.
例句
...the Jubilee Line extension.
银禧延长线
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展期；延长期
An extension is an extra period of time for which something lasts or is valid, usually as a result of official permission.
例句
He first entered Britain on a six-month visa, and was given a further extension of six months...
他最初持6个月的签证进入英国，后来又获得6个月的续签。
Ian Lentern has been granted a three-year extension.
伊恩·伦特恩已经被批准延期3年。
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扩大;扩展;延伸
Something that is an extension of something else is a development of it that includes or affects more people, things, or activities.
例句
Many Filipinos see the bases as an extension of American colonial rule...
很多菲律宾人视这些基地为美国殖民统治的延续。
That's the logical extension of my approach.
那是对我的方法的合乎逻辑的扩展。
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电话分机（亦用书面缩略ext.）
An extension is a telephone line that is connected to the switchboard of a company or institution, and that has its own number. The written abbreviation ext. is also used.
例句
She can get me on extension 308...
她打308分机就能联系到我。
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
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（设备的）延伸部分
An extension is a part which is connected to a piece of equipment in order to make it reach something further away.
例句
...a 30-foot extension cord... 30
英尺的延长线
Some of the best extensions are made from sections of rod tube or drainpipe.
最好的延长管中有些是用杆管或排水管制成的。