问题: 几句英翻汉
请高手翻译几句！
1. Liquids, which contain no free electrons, are poor conductor of electricity.
2. He who makes no investigation has no right to speak.
3. The importance of proper lubrication cannot be over-emphasized.
4. University applicants who had worked at a job would receive preference over those who had not.
解答:
1. Liquids, which contain no free electrons, are poor conductor of electricity.
液体由于没有自由移动的电子因而是电的不良导体.
2. He who makes no investigation has no right to speak.
没有调查就没有发言权.
3. The importance of proper lubrication cannot be over-emphasized.
合适的润滑的重要性不能过分强调.
4. University applicants who had worked at a job would receive preference over those who had not.
有工作经验的大学生申请人会比那些无工作经验的大学生申请人得到更多青睐.
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