extension
/ɪkˈstenʃn; ɪk`stɛnʃən/ n
1 [U] process or action of extending (extend 1,2,3); state of being extended 伸长; 延长; 延展; 伸展; 提供; 给予
The extension of the garden will take several weeks. 扩建花园需要几个星期.
the extension of scientific knowledge 科学知识的普及
the extension of a warm welcome 给予热烈的欢迎.
2 [C]
(a) ~ (to sth) added part; addition; enlargement 增加的部分; 增加; 扩大
build an extension to a hospital 扩建一医院
Our extension is nearly finished. 我们的扩建部分已接近完工.
(b) ~ (of sth) additional period of time 增加的一段时间; 延长期
an extension of one's summer holidays 暑假的延长
get an extension (of time), eg for paying a debt 获得延期（如偿债的宽限期）
He's got an extension to finish writing his thesis. 他获准延期交论文.
3 [C] telephone line leading from the main phone or switchboard to another room or office in a (large) building; its number 电话分机; 分机号码
There are telephone extensions in every office. 每间办公室都有电话分机.
She has an extension in the kitchen and in the bedroom. 她的厨房和卧室都有电话分机.
`Extension 326, please.' ｀请接326号分机.＇
4 [U] (medical or fml 医或文)
(a) action of stretching out a limb or finger （四肢或手指的）伸展
Extension of the injured arm was painful. 把受伤的胳膊伸展开是很疼的.
(b) its position when stretched out 伸展开的姿势
The leg is now at full extension. 现在腿已伸直.