而在浅海环境中，由于到达垂直线列阵的声波并不满足平面波假设，其空间增益需要作出正确估计。
However, in shallow water, because the arrival signals of the vertical linear array are not plane waves, the spatial gain needs to be estimated properly.
我们可以看到，现在的湖底或浅海底部的沉积物中形成了波痕。许多沉积岩都含有类似这种波痕的特征。
Many sedimentary rocks contain such features as ripple marks, exactly like those we can see forming in sediments at the bottom of present-day lakes or shallow seas.
它们在浅海的沉积物中扭来扭去，把猎物吞进袋状的微小躯体里，把水从嘴巴周围的圆锥形喷口排出去。
They wriggled around in the sediments of shallow seas, gulped prey into their minuscule, baglike bodies and expelled the water through cone-shaped spouts around their mouths.
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