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。
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.
他们想向公众表明他们做的工作既重要又必要。
They want to make it clear to the public that they do an important and necessary job.
这一切都是一些既重要又复杂的问题，因此，我们有必要对机动车道路交通事故损害赔偿问题进行深入探讨。
All these are some very important and complex issues, Therefore, we have to make a discussion in a depth on motor vehicle road traffic accident damages issues.
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