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.
说的是中层水层，
是一个半深水区
，
接收大约 20% 的光线。
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hind, hind limb, hindbrain, hindcasting, Hindenburg, hinder, hinderedtransition, hinderland, hindermost, hindgut,
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3G, 401(K), a,
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