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.
大型水电站装机容量论证工作具有相当技术难度和挑战性，涉及面广。
The installation capacity analysis of hydropower plant of giantt type is challenging and difficult because it involves many aspects.
这一问题颇具难度、挑战性和争议性。
The question proved to be extremely difficulty, challenging and even controversial.
对机动目标进行跟踪一直是甚具挑战性的问题，特别是跟踪高速高机动目标在理论上和实践上都有较高的技术难度。
It is a challengeable problem to track maneuvering targets, especially tracking the high speed and high maneuvering targets, which has both theoretically and practically technical difficulties.
对机动目标进行跟踪一直是甚具挑战性的问题，特别是跟踪高速高机动目标在理论上和实践上都有较高的技术难度。
It is a challengeable problem to track maneuvering targets, especially tracking the high speed and high maneuvering targets, which has both theoretically and practically technical difficulties.
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