But IFD is an expensive mechanism, as realising the derivation may require downloading and building a lot of dependencies.
产业转型升级的难点在于新旧动能能否接续转换。近年来，萍乡市坚定不移推动科技创新和产业创新深度融合，在推进传统优势产业“智改数转”的同时，统筹土地、资金、创新等各类要素向“四大赛道”聚焦聚力，不断培育新动能、塑造新优势，全力打造产业转型升级标杆城市。
，这一点在新收录的资料中也有详细论述
Real game engines use this pattern (or its 3D cousin, the Octree) for broad-phase collision detection: the quadtree quickly identifies candidate pairs, and a more expensive narrow-phase check tests the actual geometry.，更多细节参见新收录的资料
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