相对于封闭场地的比赛，充满了挑战性和难度，更是对参赛选手的体能与技能以及心理的挑战。
Comparing with the competition in closed area, SOT is full of challenge and difficulties for entrants on energy, skills and psychology.
Sandel教授在课程中这样介绍康德：最具挑战性和最有难度的思想家之一。
Professor Sandel introduces Immanuel Kant — one of the most challenging and difficult thinkers in his course.
与形状优化和尺寸优化相比较，拓扑优化的难度最大，也最具有挑战性。
Compared with shape and size optimization, it is considered as the most difficult and challenging problem.
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