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.
无论你目前取得了多少工作经验或证书，通过专家级实验考试无疑是个非常具挑战性的目标。
Regardless of your current work experience or certifications' credentials, passing any Expert-level lab exam is certainly a challenging goal.
无论你目前取得了多少工作经验或证书，通过专家级实验考试无疑是个非常具挑战性的目标。
Regardless of your current work experience or certifications' credentials, passing any Expert-level lab exam is certainly a challenging goal.
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