尝试使用ruby/rails中的Prawn PDF创建一个两列无序的项目符号列表？

require 'prawn'

Prawn::Document.generate("project_list.pdf") do
  page_size 'A4'
  margin 50

def unordered_list(items)
  column_box([0, cursor], columns: 2, width: bounds.width) do
    items.each do |item|
      text "• #{item}", indent_paragraphs: 20
    end
  end
end

unordered_list(["项目1", "项目2", "项目3", "项目4", "项目5"])

end

puts "PDF已生成"

require 'prawn'

Prawn::Document.generate("project_list.pdf") do
  page_size 'A4'
  margin 50

  def unordered_list(items)
    column_box([0, cursor], columns: 2, width: bounds.width) do
      items.each do |item|
        text "• #{item}", indent_paragraphs: 20
      end
    end
  end

  unordered_list(["项目1", "项目2", "项目3", "项目4", "项目5"])

end

puts "PDF已生成"