This is because geologists find them by listening for the tell-tale boiling water using hydrophones, but at extreme depths the pressure is too high for water to boil.

这是因为，地质学家通过用水中听音器听取翻滚的水来确定火山的存在，当火山位置极深时，水压太大以致火山爆发也不能引起水翻滚。

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Portable boiling elements that can boil small quantities of water are useful when the right voltage of electricity is available.

如果有相配的电压，可以煮少量水的便携式热水装置是有用的。

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Method: Dip this product in the warm water till soft and keep it in boiling water for 20 minutes, then stir and fry with ham, bamboo shoot or boil with chicken or duck.

食用方法：将本品于温水中浸泡至回软，煮沸20分钟左右，取出后与肉类、蔬菜类炖、炒或煮成汤料食用等。

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Chris Aram has designed a gadget that automates the boiling process on stovetops, ensuring pots never boil dry or catch fire.

CNN: Sensor keeps cooking on the boil