"These books are heavy."

Translation: Buku-buku ini berat.

[dgaeremie]

Buku ini berat

[Appers6]

Why does this answer insist on buku-buku? Surely "buku ini" can mean "this book" and also "these books"?

[Away54]

When we want to lift a lot of heavy things and feel tired, we say, "Barang-barang ini berat".

Barang-barang word implies many barang. It's similar to buku-buku.