Lua传递多维数组

您好,我是一个相当新的Lua程序员,我正在尝试将参数传递给多维数组,但我一直得到一个零值错误。

local transform = {
  forward = {
    distance = 1,
    swing = robot.swing,
    move = robot.forward
  },
  left = {
    distance = 1,
    swing = robot.swing,
    move = robot.forward
  },
  down = {
    distance = 1,
    swing = robot.swingDown,
    move = robot.down
  }
}

function testFunc(transform, direction)
  print(transform.direction.distance)
end

myFunc(transform, forward)