Deep, penetrating sonar shows us that the animals form dense layers.

水下的穿透声呐向我们展示， 这些动物组成了厚厚的一层。

What you see around me is a thick, dense layer of pollution.

你可以在我周围看到浓浓一层污染。

On the surface of their skin is a super dense layer of pigment granules.

他们的皮肤表面是一层超密集的色素颗粒。

Above the dense layer of clouds, Venus isn't that bad.

在浓密的云层之上，金星并没有那么糟糕。

A dense layer of smoke from wildfires in the western United States and Canada has reached the east coast of the continent.

美国西部和加拿大的大火产生的浓烟已飘到该大陆东岸。

Tropical rainforests, like the Amazon and the Congo, gradually bury the remnants of humanity under a dense layer of green.

热带雨林，如亚马逊和刚果，逐渐将人类遗迹掩埋在茂密的绿色之下。

Now, surrounded by the muscularis externa is the submucosa, which consists of a dense layer of tissue that contains blood vessels, lymphatics, and nerves.

在肌层包裹下的是粘膜下层；它由一层致密组织构成，其中含有血管、淋巴和神经。

It helps to know also that the water table can be further altered by impermeable layers in the soil, such as rocks or dense layers of clay called " hardpans" .

这还帮助我们了解土壤中的不透水层，例如岩石或被称为“硬质地层”的致密层，也能进一步改变地下水位。