Schreck, Johann Terrenz Yuanxi Qiqi Tushuo Luzui 1627
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​第​十​一​款 ​天​平​針​心​有​三​在：​或​在​梁​之​上​邊，​或
​在​梁​之​下​邊，​或​在​梁​之​居​中，​如​後​三
​圖​。