Current research comparing chemical data taken in the 1960s and 1970s with the situation today may clarify things.
目前已有研究试图把60-70年代的监测数据和现状的进行比较，以期找清原因。
The first part is the introduction that mainly points out the current research situation of this subject, then the research meaning and value, the research approaches, etc.
第一部分为绪论，主要是点明本课题的研究现状，继而明确本课题的研究意义及价值、研究方法等。
The part of the introduction mainly points out the current research situation of the subject, and analyses the striving direction and research meaning in the future.
绪论部分主要点明了本课题的研究现状，继而明确本课题今后的努力方向以及研究意义。
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