在装配不可行区域，零件的位置不能求解。
The part position in assembly infeasible regions cannot be solved.
如何有效地均衡可行区域与不可行区域的搜索是约束优化中的关键问题。
It is a key problem to balance searching for feasible and infeasible areas efficiently.
虽然这一方法在牛产量不大的区域并不可行，但来自牛肉的生物柴油燃烧起来比植物性生物柴油更加干净。
Biodiesel from beef burns cleaner than plant biodiesel, though it may not be scalable outside the beef belt.
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