He challenged the premise that in nature genes interchange with each other. 他對自然界遺傳基因會互換的假設提出質疑。
Transposition is described as an interchange in the position of two teeth within the same quadrant of the dental arch. 摘要牙齒錯位乃指在牙弓上的同一象限中，兩顆牙齒萌出時位置互換的現象。
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