extension

1. N-COUNT An extension is a new room or building that is added to an existing building or group of buildings. (已有建筑或建筑群的) 延伸建筑

We are thinking of having an extension built, as we now require an extra bedroom. 我们正在考虑扩建房屋，因为我们现在需要多一间卧室。

2. N-COUNT An extension is a new section of a road or railway that is added to an existing road or railway. (已有公路、铁路的) 延长路段

...a proposed extension to the No. 7 subway line. …提议的地铁7号线的一段延长路段。

3. N-COUNT An extension is an extra period of time for which something lasts or is valid, usually as a result of official permission. 延长的期限

He first entered the country on a six-month visa, and was given a further extension of six months. 他最初凭有效期为6个月的签证进入这个国家，之后又得到了6个月的续签。

4. N-COUNT Something that is an extension of something else is a development of it that includes or affects more people, things, or activities. 延展

Many Filipinos see the bases as an extension of American colonial rule. 许多菲律宾人把这些基地看作是美国殖民统治的延展。

5. N-COUNT 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 is also used. (电话的) 分机[also N num]

She can get me on extension 308. 她可以通过分机308找到我。

6. N-COUNT An extension is a part connected to a piece of equipment in order to make it reach something further away. (设备的) 延伸部分

...a 30-foot extension cord. …一条30英尺的延长线。