The people there were able to divide the sky into symmetrical boxes, according to the main directions, north, east, south and west.
根据主要的东南西北方位,那里的人们可以将天空分成对称的区域。
Gene therapy is one of the main directions of restoring bone defect.
基因治疗是修复骨缺损的主要研究方向之一。
Main directions are represented by archeology biology medicine nanotechnology etc.
其主要应用方向包括考古学、生物学、医药、纳米技术等等。
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