Parents toss a lost bottom tooth up to the rooftops, so that the new tooth will grow upwards, too.
父母将孩子下牙床的掉牙扔上屋顶，这样新牙才会向上长。
The converging lower portion of each tooth follows the convergence of the bottom portions of the sidewalls.
每个齿的收敛下部遵循侧壁底部的收敛性。
The converging lower portion of each tooth follows the convergence of the bottom portions of the sidewalls.
每个齿的收敛下部遵循侧壁底部的收敛性。
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