If the A* calculation for a shortcut (in Step 3) finds it's now impassable, or if its actual detailed cost is significantly different (e.g., 20%) from the pre-calculated shortcut value:
The FTSE 100 is sailing ever higher on a big wave of enthusiasm for London listed stocks. The blue-chip index has opened at fresh record levels. It’s been on a breathtaking run upwards, accelerating its surge higher since the start of the year, rising by more than 9%. Momentum appears to be on its side with the psychologically important 11,000 mark now in its sights. Its mining constituents have been benefitting for demand for metals in particular, as signs indicate that a commodities super-cycle is underway, with huge demand for metals and minerals needed to power the green revolution and build AI infrastructure. Geopolitical tensions and rising debt levels are keeping demand for safe precious metals intact, while defence contractors continue to benefit from the big uplift in spending on military capabilities.
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Nasa Apollo missions: Stories of the last Moon men
核心的瓶颈首先在于精度问题。目前技术虽然在不断进步，但在打印精细结构或大尺寸零件时，依然难以达到高精度装配所需的公差要求及优秀的表面质量要求，这直接导致了打印件难以直接作为最终功能部件使用。