场景二：哈利走进卧室时，一个叫多比的家养小精灵正等着他。多比警告哈利千万别回到危机四伏的霍格·沃兹学校去。
Scene 2: When Harry enters his bedroom, the house elf Dobby is waiting for him who warns him that under no circumstances is he to return to Hogwarts, where a great danger is waiting for him.
低电压(12伏)系统正成为广泛用于住宅照明使用。
Low voltage (12 volt) systems are becoming widely used for residential lighting.
如果输入的电压是正三伏，那么输出的电压便是负六伏。
If the input voltage is plus three, it comes out as minus six.
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