第三次来加州理工，钱学森先生的母校，NASA的摇篮。图三的单词你都认识吧？
tenacity n.坚韧品格
creativity n.创造力
integrity n.诚实正直
This triangle is equilateral to give the same import to the three qualities. But integrity is purposely placed at the base as it is the foundation of the other two. http://t.cn/R2L8eK5