When we make a deal, it's like fighting a war. We have to choose to attack and defend at the most advantageous position. The battle in the valley is the best terrain. One man can guard the barrier and no one can open it. The advantages and disadvantages of both sides in the plain battle can be seen at a glance. This battle is time-consuming, laborious and costly. Vitality, choose to intervene at the best advantage. Even if it fails, but coupled with the fast running, the loss rate will be very low. Only by protecting your strength can you wait for the next better attack. So learn to lose less or not lose first, and then it will be your turn in the end. make money.