Scientists had assumed that the dramatic alterations in beak shape, height, width and strength would require the accumulation of many chance mutations in many different genes.
科学家们曾经以为，这些喙在形状、高度、宽度和强度上的明显的变化，可能需要很多种不同基因经过很多偶然变异的慢慢积累。
It is assumed that the object distance and the incident height of each lens do not change with temperature.
推导过程中假设物面位置不随温度发生变化，并且忽略分离薄透镜组中各组分上光线入射高度随温度的变化。
A question of the assumed channel height is represented and the reasonable reasons are given. The conclusion is useful for calculating the lightning return-stroke electromagnetic fields in the future.
指出了国外文献计算回击电磁场时在选取通道高度方面存在的问题，并作出了合理的解释。
A question of the assumed channel height is represented and the reasonable reasons are given. The conclusion is useful for calculating the lightning return-stroke electromagnetic fields in the future.
指出了国外文献计算回击电磁场时在选取通道高度方面存在的问题，并作出了合理的解释。
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