Be professional.

Looking businesslike is the first step to acting businesslike, and people will take you more seriously if you are well-groomed. This also applies to body language, so always make eye contact and keep good posture, or you may appear to lack confidence.

(表现职业化。衣着职业化是体验你是否专业的第一步，如果你注意修饰的话，人们对待你总是更认真一些。这还适用于肢体语言，要经常和别人进行眼神交流并保持好的身体姿势，否则会看起来象没有自信的样子。)