You need to be hospitalized.你需要住院。

A:I guess you should know that you need to be hospitalized.

我想你應該知道你需要住院。
B:Of course I know.
我當然知道。
A:Now you can go to the in-patient department to go through the admission procedures.
現在你可以去住院部辦理住院手續了。
B:Ok,I'll go right now.By the way,do you think it'll have to stay in the hospital for long?
好的，我馬上就去辦理。順便問一下，你認為我需要住院很久嗎？
A:It's hard to say.It depends on your recovery condition.But you need to stay for at least one day for observation.
很難說，這得看你的恢復情況了。不過你至少需要住院觀察一天。
B:Thank you,doctor.
謝謝你，醫生。