求一些英语句子的讲解

求一些英语句子的讲解
Para 1:Of course,body language can be misread,but many gestures and actions are universal.
Pare 2:The most universal facial expression is,of course,the smile--- its function is to show happiness and put people at ease.
Para 3:From the time we are babies,we show unhappiness and anger by frowning.
Para 4:There are many ways around the world to show agreement,but nodding the head up and down is used for agreement almost worldwide.
Para 5:How about showing that I am bored?Looking away from people or yawning will,in most cases,make me appear to be uninterested.
Para 6:Being respectful to people is subjective,based on each culture,but in general it is probably not a good idea to give a hug to a boss or teacher.
Para 7:With so many cultural differences between people,it is great to have some similarities in body language.
需要这些句子的翻译,具体语法知识和重点词汇的讲解.
急用!