Our extension is nearly finished.是什么意思？

Our extension is nearly finished.

我们的扩建部分已接近完工。

our

pron. 我们的，we的所有格形式，<口>我们家，敝；

例句
Roland was taken aback by our strength of feeling...
我们反应如此强烈，令罗兰大吃一惊。

extension

n. 伸展，扩大，延长，延期，[医]牵引，电话分机；

例句
He will appeal to the state for an extension of unemployment benefits...
他将呼吁国家延长领取失业救济金的时限。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

nearly

adv. 几乎，差不多，险乎；

例句
His increasing alignment with the Reagan administration nearly cost him re-election.
与里根政府日益紧密的关系差点让他失去了连任的机会。

finished

adj. 完成了的，技术高超的，精湛的，〈俚〉死了的，完蛋了的；v. 结束，完成( finish的过去式和过去分词)；

例句
Despite the adverse conditions, the road was finished in just eight months.
尽管存在种种不利情况，公路还是仅用8个月就完工了。