我们从电视中经常可以看到,美国总统无论身在何处,总有一群板着面孔、蓄着短发、身着淡褐色外套、戴着一副令人生畏墨镜的人簇拥着。总统走到哪里,他们就跟到哪里。据说,戴墨镜既能挡住喷射的油漆或酸类物,防止伤害眼睛,又能使人看不出他在注视谁,使人总觉得他在盯着自已,容易对人产生威慑力。这些人就是专门负责保护总统及其家人安全的美国安全局特工处下属的美总统卫队队员。 As we can often see on television, no matter where the president of the United States is, there are always a group of people with short faces, short hair, light-brown jackets and people wearing awesome sunglasses. Where did the president go? It is said that wearing sunglasses can block the spray of paint or acid, to prevent eye damage, but also make people can not see who he is watching, people always feel that he was staring at themselves, easy to deter. These are the U.S. Presidential Guard members who specialize in the security of the president and his family members.