“按理说”造句

我们被轻易地击败了。按理说我们本应该大败他们。
We got whacked. On paper we should have wiped the floor with them.

按理说你是不能走进这个房间的, 你知道 吗 ?这是专为此地工作人员使用的.
You realize that by rights you should not come into this room, don't you? This is only for people who work here.

按理说该怎 麽 做?
What is the form ( ie the correct thing to do )?