电脑的普及给我们带来了方便，但如果使用不当，它就会影响我们的健康。请根据下面的要点，用英语写一篇短文，指出过度使用电脑给人体健康......

acknowledge　　vt. 承认，确认　　acknowledge sb/sth （to be/as） 承认、认可某人、某事（是）……　　acknowledge doing sth 承认做…......

acknowledge　　vt.承认，确认　　acknowledge sb/sth (to be/as) 承认/认可某人/某事（是）……　　acknowledge doing sth 承认做…......

Crankshaft assembly failure is one of the main factors that affects the reliability and service life of engines.The line......

提出建议和意见的开头常用句型　　文章开头时，要提出自己的想法和意见，亮出自己的观点。常用句型有：　　It must be realized that .......

Awell-developed exhibition industry is usually regarded as an important criterion in measuring a city’s economic and so......

一、单词拼写：根据句意和首写字母或漢语提示，用本单元所学词的正确形式填空。...