作业帮the class are doing a__research of the Changjiang river
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/30 09:59:57
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the class are doing a__research of the Changjiang river
the class are doing a__research of the Changjiang river
the class are doing a__research of the Changjiang river
further
do a research是做研究的意思,这里加further表示更进一步的.
或者也可以用detailed, 意思是详细的
参考下吧,希望对你有所帮助.
necessary 必要的，重要的