If you focus the sun's rays on dry wood with a burning-glass, it will start burning.

如果你用取火镜使太阳光线聚焦在干木头上，木头就会燃烧起来。

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If such heaters were covered with thermoelectric generators the sun's rays could be put to sequential use. First, electric power would be extracted from them.

如果这种加热器都安装上能付诸连续使用太阳光热电发电机，那么首先，电能能够从中提取。

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But if you're wearing expired sunscreen, you're not protecting your skin from the sun's harmful rays as effectively as you could.

可是如果你涂抹过期的防晒霜就不能有效的防止太阳的有害射线对皮肤的伤害。

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If such heaters were covered with thermoelectric generators the sun's rays could be put to sequential use.

ECONOMIST: Solar power