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。
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。
Put some spaghetti into the boiling water and boil it until it is tender.
在开水中放一些细通心面，一直煮到面条变软。
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