Imagine a bucket of water down on the green between the TaylorMade R9 Irons and the hole
, and then see how water flows. Judge the speed and line of the ball. Sometimes the outcome may be not very easy, sometimes very obvious. But spend some time and energy to do this exercise can accumulate a lot of experience, and concluded from the failure to practice a lot of useful things, so you will be greatly improved your way of reading the green.