就是这个美国人改变了见面问候的礼仪.不再握手了,都来“撞肘”了.（有点像赵本山的台词)美国人觉得手上不卫生最容易感染病菌

Americans changed the ritual greetings。They collide the elbow to replace the handshake。They felt the hands unsanitary,because it is the most easily infected with bacteria。Thus the emergence of a new protocol to meet --- "collide the elbow " 。it reminds me of the NBA game,elbows up on behalf of the strength and the Confrontation。Americans also had a humorous When they face the H1N1 influenza。It seems that they use this new type of etiquette to express the determination of the fight against influenza。