explanatory和expository的区别是什么？

explanatory 英[ɪkˈsplænətri] 美[ɪkˈsplænətɔ：ri]

adj. 解释的； 解释性； 说明的；

expository 英[ɪk'spɒzətrɪ] 美[ɪk'spɑ：zətɔ：rɪ]

adj. 说明的，解释的；

以上是两个词的解释

当这两个词作为解释的的意思时，意思几乎是相等的

也就是说，一般当你用时，这两个词可以互换（这两个词是explain的派生词）

以下作文怎么写,哪位高手能写一下？谢谢！！

Knowing how to use a computer is an essential skill for everyone who (1) wants to succeed in today's world . One basic computer program that everyone should learn to use is the word processing program . Most types of writing are easily (2) produced with a word processing program . For example (3) , everyone must sometimes write a business letter . Using a computer allows you to arrange(align整理、排列)and rearrange information easily , making your writing more complete (4) and exactly correct . Word processing programs can help you check your spelling (5) and grammar . A computer makes it easy to correct manually (6) .

Computers can be used (7) for much more than word processing , however . Other areas are picture design , programming , and creating new graphics (8). Jobs in(9) the computer field are growing , and strong computer skills can serve (10) you well now and into the future .