The present paper reviewed the current situation of research and control on poplar diseases in China.
该文回顾了我国杨树病害研究与防治的现状。
The introduction mainly introduces the paper's purpose, significance, current situation of research and research approaches.
绪论主要介绍了选题的目的、意义、研究现状以及研究方法。
The preface introduces the current situation of research on the joint dangerous act, the theoretical and practical meaning, and content of this dissertation.
引言主要介绍本研究领域的国内外研究现状，本论文研究的理论和实践意义以及所要论述的内容。
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