I'll do the second floor and you do the first floor.
我来吸二楼，你吸一楼吧。
The elevators on the left go to the 10th Floor.They stop at every floor.
左边的电梯升到10楼，每一楼都停。
The new building was grafted on the old one
新楼与旧楼连接在一起。
At the top of the building there is a red flag.
大楼楼顶有一面红旗。
three rooms on the ground floor, three chambers on the first, and an attic above.
楼下三间，楼上三间，顶上一间气楼。
a multistoried building of offices or apartments.
一个楼层很多的办公大楼或是公寓楼。
climb a long/short flight of stairs
上一大[小]段楼梯
It has one office building, one lab building and two teaching buildings.
校内有一幢办公楼,一幢实验楼和两幢教学楼。
an open shaft through the floors of a building (as for a stairway).
一种通过建筑物楼层之间的（像楼梯）开口楼井。
A partial story between two main stories of a building.
夹楼，夹层楼面一座建筑中两层主楼面之间的部分楼面
This sentence can be paraphrased as though very simple and crude, the stairway unexpectedly had a handrail that seemed not well matched with the crudeness of it.
（一段楼梯已经磨损，溜滑的木质楼梯直通楼上，楼梯居然还装有扶手。）
"Belfry: Bell tower, either freestanding or attached to another structure."
钟楼: 独立的或附在另一建筑上的钟楼。
" Belfry： Bell tower, either freestanding or attached to another structure."
钟楼:独立的或附在另一建筑上的钟楼。
a very tall building with many storeys.
一个有非常多的楼层的大楼。
I fell right to the bottom of the stairs.
我从楼梯上一直摔到楼梯下面.
Up there were the same signs of decay.
楼上的情景与楼下的一样破落。
A bell tower, especially one attached to a building.
钟楼特指附加于另一个建筑物的钟楼
a forward plunge down a flight of stairs.
沿着一段楼梯向前一跳