For example, if you intend to visit a rainforest to take photos of gibbons, practice in an environment that has low light levels and program your camera Settings accordingly.
例如你计划去热带雨林拍摄长臂猿，那么就可以练习在弱光条件下拍摄，并据此调整好你的相机。
Since the brain produces the most melotonin in the middle of the night when it is dark, night- shift workers - whose bodies are saturated by artificial light - have abnormally low levels.
大脑在晚间会产生最多的抗黑变激素，而当黑夜加深，上夜班的工人在人造灯的照射下时，抗黑变激素的水平就会不同寻常的低。
At night, it's the extra-sensitive rods that take over — this is why it's difficult to detect color in low levels of light.
夜间，特别敏感的视杆细胞在眼睛视物占有主导地位—这就是为什么在昏暗的光线条件下我们很难看到事物的色彩。
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