tenement
n
1 apartment or room let for living in (出租的)公寓, 房间.
2 (US also `tenement-house) large building with apartments or rooms let to a number of families at low rents 廉租公寓(多户合租, 租金低廉的大房或屋).
3 (law 律) land or other permanent property held by a tenant (承租者的)保有物, 占有物, 享有物.
To answer the first part of your question, I'd like to say that our studies were very extensive.
你问题的第一部分,我要说的就是我们的研究非常广泛。
and there is a very firm rule that the bank has no right or authority to pay out a customer's money on a cheque on which its customer's signature has been forged.