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.
采矿技术的创新不是一种选择,而是我们对工人和环境应尽的义务。
如果你愿意,错误地思考,但在所有情况下,为自己思考。