But when it reaches shallow water, something called wave shoaling occurs.

但当海啸到达浅水地带，波变浅的情况就发生了。

The result is not just a model of shoaling fish, but a precise numerical representation of their actual movements and fields of vision.

这个成果不仅是鱼群的模型，更是鱼群真实行动和视野的精确数值反应。

The compact round body of its root expands into two broad, firm, flat palms or flukes, gradually shoaling away to less than an inch in thickness.

它那紧实浑圆的尾巴根伸展开来，形成两片宽阔而结实的扁平的掌状物或是尾叶，逐渐变薄，最后不到一英寸厚。