We're talking about the mesopelagic zone, it's a region of semi-deep water that receives only about 20% of the light that you get up on the surface.
我们说的是中层水层，这是一个半深水区域，它只接收大约 20% 的光线。
Mesopelagic zone
原声例句
PBS趣味科普
中文百科
中层带
海洋中层带（英语：Mesopelagic；希腊语：μέσον）也被称作中层浮游区或黄昏区。这一区域处于海平面下200米至1000米（约660至3300英尺）的位置，它被称作黄昏区是因为它处于透光的海洋光合作用带与黑暗的半深海带之间。
英语百科
Mesopelagic zone 中层带
The Mesopelagic (Greek μέσον, middle) (also known as the middle pelagic or twilight zone) is that part of the pelagic zone that extends from a depth of 200 to 1000 metres (~660 to 3300 feet) below the ocean surface. It lies between the photic epipelagic above and the aphotic bathypelagic below, where there is no light at all.
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