扩建的英文：
add an extension to a building

参考例句：

Enlarge a house
扩建房屋。

Extend a factory building
扩建厂房

Subject: Expansion of the Data center
事由:扩建数据中心

There is insufficient space for enlargement of the buildings.
没有足够的空间扩建这些建筑。

A large-scale expansion project started here in 1750 and was completed in 15 years.
1750年，在这里进行了大规模扩建，历时15年建成。

Please let me know if we can get together then to discuss this proposed expansion of the data center.
如能面晤并讨论数据中心拟议中的扩建，请不吝赐告。

"Though it was rebuilt and extended during the two dynasties, it still retains its original layout today"
明清两代多次重建和扩建,现在仍保持原来的布局。

add是什么意思：
v. 加，加起来，做加法；增加，添加，扩大；补充说
n. 加法；补充部分

Add two and eight and you will have ten.
2加8得10。

Add righteousness to a city and you have a community.
给城市一份正义，你就得到一个社区。

Add a dash of balsamic vinegar.
加入少许香脂醋。

extension是什么意思：
n. 伸展；延长；延期；电话分机

Removed the sablotron extension in favor of the new XSLT extension.
去掉了sablotron模块，使用新的XSLT扩展模块

The greatest difference was noted in extension.
伸展测试的差异是最显著的。

addition or extension that prolongs sth
增加或延长的部分.

building是什么意思：
n. 建筑物，房屋；建筑业

Buffer buildings
缓冲建筑物

building elevation
建筑立面

This is a substantial building.
这是个坚固的建筑物。