When China’s leader, Xi Jinping, arrives at Joint Base Andrews, every step he takes down the stairs from his plane will be scrutinized for clues about his health. 中国领导人习近平抵达安德鲁斯联合基地时，他从专机舷梯上走下来的每一步都会受到仔细审视，以寻找有关他健康状况的蛛丝马迹。 Mr. Xi is China’s most dominant…