If you saw a father patting his son on the back while smiling happily, what would you think was going on？① You would probably think that the father was congratulating② his son on doing something well, maybe passing an exam or winning a race. You would know what was going on because you understood the message conveyed by the father's body language③. Across the world, a pat on the back and a smile usually means，“Well done”．
Body language is used every single day by people of different nationalities all over the world. It is a language without words that consists of gestures, facial expressions and body movements that greatly add to — and sometimes even replace — spoken language④. Body language is used to⑤ communicate⑥ both attitudes and feelings from affection to anger just like any other language, but it differs from⑦ spoken language as it is not always explicit⑧. Somebody jumping for joy is easy to see while⑨ a raised eyebrow⑩ conveying doubt? is easier to miss.
①pat/pæt/vt. & n．轻拍；拍
see sb. doing sth. 看见某人正在做某事
pat sb. on the back 拍某人的背
if 引导条件状语从句，主句中would you think 是插入语。
②congratulate/k?n'ɡræt??leIt/vt.祝贺
congratulate sb. on (doing) sth. 祝贺某人(做)某事
③conveyed by ... 是过去分词短语作后置定语，修饰 the message。
④that consists of ... spoken language 是that 引导的定语从句，修饰language。在这个定语从句中又包含了一个that 引导的定语从句，修饰gestures, facial expressions and body movements。两个that 均在各自的定语从句中充当主语。
⑤be used to do 被用来做 be used to doing 习惯于做
⑥communicate ... to ... 表达，传达
communicate ... with ... 与……交流/沟通
⑦differ from 与……不同 be different from 与……不同
⑧explicit/Ik'splIsIt/adj.明确的；清楚的
as 引导原因状语从句。
⑨while是并列连词，连接两个并列分句，意为“而，却”，在语意上表示转折。
⑩eyebrow/'aIbra?/n.眉毛
?conveying doubt 为现在分词短语作后置定语。
