Hai teman! Indonesian does not have plural nouns. So, Indonesian nouns can be translated as singular or plural in English. When necessary, the nominal reduplication can be used to stress the plural meaning.
Selamat belajar! :)
I think it means to say something like "jeruk jeruk" for the plural of oranges
Dalam bahasa indonesia tidak ada tunggal dan jamak.
DiegoJaviUnlam answer is right.