It is courage based on confidence, not daring, and it is confidence based on experience.
它是基于信心的勇气,而不是胆量,它是基于经验的信心。
-- Jonas Edward Salk 沙克
It is courage based on confidence, not daring, and it is confidence based on experience.
它是基于信心的勇气,而不是胆量,它是基于经验的信心。
-- Jonas Edward Salk 沙克