用and so on表示等等的话,前面至少要有两个还是三例子个?

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• 用and so on表示等等的话,前面至少要有两个还是三例子个?
• 用and so on表示等等的话,前面至少要有两个还是三例子个?
• “and so on and so on”的意思是?
• Many location decision of significant construction programs in China are based on the research done by human geographers,such as the remove of capital steelworks,the location decision of No.2 capital airdrome and so on.so on的用法,如要不要用逗号隔开,steelworks 和the location两句之间要不要用and连接,