That is the biggest drawback to solar energy, the problem of what do you do in cases where the sun's light is weak or virtually non-present.
这是太阳能的最大缺陷——当太阳光变弱或者不存在时，人们该怎么解决。
The reflected light is weak and completely linearly polarized.
反射光较弱，且是完全线偏振的。
In the dark night it is the most shining a, though the ray of light is weak.
黑夜中它是最闪亮的一朵，尽管光芒微弱。
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