4.重复共同的定语 Metals are the best conductors and gases the poorest conductors ofheat The law of conservation and transformation of energy is the chief basis of engineering practice. 重复省略的部分 Water has the property of dissolving sugar, sugar the property of being dissolved by water High voltage is necessary for long transmission line while low voltage for safe use.4. 重复共同的定语 Metals are the best conductors and gases the poorest conductors of heat. The law of conservation and transformation of energy is the chief basis of engineering practice. 二、重复省略的部分 Water has the property of dissolving sugar, sugar the property of being dissolved by water. High voltage is necessary for long transmission line while low voltage for safe use