1 . The heart is mesial to the lungs.
心脏位于左右肺之间.
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2 . Method: 40 curved mesial - buccal canals in mandibular molars were selected and divided into two groups randomly.
方法: 选取40个下颌磨牙近中颊侧弯曲根管,随机分为两组,每组20个根管.
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1.①正中的
2.②近中的：接近牙弓的中线的
