Power System Voltage Stability is a challengeable problem .
电力系统电压稳定性是一个具有挑战性的问题。
Image segmentation is the basic and challengeable problem in image processing field.
图像分割是图像处理中最基本且具有挑战性的问题。
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。
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