博树 每周一词 impertinent =adj. 不恰当的；无礼的；粗鲁的；不相干的,rude and not respectful, especially to someone who is older or more important. 《科学进化史》的作者Jacob Bronowski曾有下面一个关于科学的定义："That is the essence of science: ask an impertinent question, and you are on the way to the pertinent answer." 这是科学的必要性：提出看似不恰当的问题，并追寻合理的答案。