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。

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For weak of the body provide energy and regulate balance to promote a healthy body.

为虚弱的身体提供能量，调节平衡促进身体健康。

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Shock waves can form when energy is quickly put into a confined channel; weak shock waves can be formed as trains enter tunnels.

当能量在瞬间通过一个限制性通道时，冲击波就会形成；火车在穿越隧道时就能产生微弱的冲击波。

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The actual technology used to generate electrical energy has only a weak influence on the cleared price of energy in a large free market of this sort.

FORBES: How The Price For Power Is Set

But methanol is a weak energy source.

FORBES: Pip-squeak Power Plant

Even the strong results failed to boost the weak outlook for energy stocks as Halliburton shares fell by almost 8% yesterday.

FORBES: Halliburton Stock Undervalued By $20