1 . The heart is mesial to the lungs.
心臟位于左右肺之間.
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2 . Method: 40 curved mesial - buccal canals in mandibular molars were selected and divided into two groups randomly.
方法: 選取40個下頜磨牙近中頰側彎曲根管,隨機分為兩組,每組20個根管.
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1.①正中的
2.②近中的：接近牙弓的中線的
