Through the research, analysis and study, the writer draws a conclusion that the application of cohesion theory into senior high school English writing is both necessary and important.

通过调查、分析和研究，笔者得出这样一个结论：衔接理论在中学英语写作中的应用既必要又重要。

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It is both important and necessary to note this difference.

注意到这个差别是重要的和必要的。

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The validation test has been a necessary and important process, which assumes the double task in checking the correctness of both the design and test programs.

验证测试担负着检测芯片设计和检验测试程序正确性的双重任务，是芯片开发中不可或缺的重要环节。

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"We both want to give him a chance to show this and then it's also necessary and important the Israelis now end their attacks so we can give peace a new chance, " he said.

CNN: Arafat asks for chance to stop terrorists