Do a second pass to clean up the code/comments and make further optimizations
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Author(s): Yong Jiang, Tianshou Liang, Jiyuan Zhu，这一点在搜狗输入法下载中也有详细论述
第四十四条 按次纳税的纳税人，销售额达到起征点的，应当自纳税义务发生之日起至次年6月30日前申报纳税。