I have come to believe that a great teacher is a great artist and that there are as few as there are any other great artists. Teaching might even be the greatest of the arts since the medium is the human mind and spirit.
相关系数的可能误差不是一个固定的量,而是取决于样本的大小。
当你成为中央银行时,你必须考虑那些不可想象的事情。