three more chairs同义句转换为another three chairs。another three chairs的意思是再来三把椅子。another three chairs的例句：We need another three chairs（我们还需要三把椅子）。

three more chairs的例句：They need three more chairs in their classroom（他们的教室还需要3把椅子）；We need three more chairs at home（我们家里还需要再来3把椅子）。