"The mouse is under the chair."
Translation:쥐가 의자 밑에 있어요.
아래 is more diverse, it can be translated like the bottom, but can also be "beneath." 밑에 means under
Like 전은규 said: in Korean, it is not a critical problem which is the sequence of word in the sentence So, 의자 밑에 쥐가 있어요 쥐가 의자 밑에 있어요 Both of them can be possible