Because of the difference of the race culture and the dissimilarity of the economic activities realm, the ethnic insulation phenomenon naturally produces, but the contrived factor is not obvious.

由于民族文化的差异以及经济活动领域的不同，民族隔离现象自然地产生，但人为因素并不特别明显。

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Last rubber bands generally speaking, the row of tooth together will because of oneself of tooth move rate of speed and the doctor's technique everyone noodles factor but dissimilarity.

上橡皮筋一般来说，牙齿的排齐会因本身的牙齿移动快慢和医生的技术各方面因素而不同。

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