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And it's all free, just waiting to be harvested. So, it makes sense that we'd eventually start using it to power our homes and gadgets. Over the past couple of decades, I've watched solar panel technology improve in efficiency to the point where even relatively small panels can deliver a meaningful amount of energy.
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从讲师晋升到专任副教授,往往要经过八九年甚至十来年,在这个过程中,因教学需要,接触不同领域的知识,不断拓展视野,最后才以某个专业领域的出色成绩,获聘为专任副教授,从此有了明确的专业方向,长期集中研究某一领域。再经过八到十年,晋升教授,然后再有八到十年,就到了退休年龄(国立大学通常为63岁,退休前或退休后再转聘到私立大学,再至70岁退休),那时通常已在各自的领域取得令学界认可的成绩。这样的例子其实中国也曾有过,我的硕士导师徐朔方先生就曾庆幸自己在调入高校任教的头几年内,教遍了大学中文系的全部文学课程,迫使他涉猎了更为广阔的范围,为日后的专精打下了坚实的基础。