The theory was that great nations start out tough-minded and energetic. Toughness and energy lead to wealth and power.
但凡大国，必兴起于坚强的意志和充沛的能量，这两者将为它带来财富和权力。
2
For the UPR with greater brittleness, the brittle-tough transition was observed only when the toughness of the resin was characterized by fracture toughness at a slower loading rate.
对于脆性较大的UPR，只有在采用加载速度较慢的断裂韧性来表征其韧性时，方能观察到这一脆韧转变现象。
3
Two important facts, crystal shape and magnetic inclusions, which affect toughness index were expounded. Especially, magnetic inclusions affect thermal toughness index more than tough ness index.