Because you haven't imported the Vector type, there will be a vaguely familiar symbol in the left margin, a red box with an "x" combined with a yellow light bulb.
2
针对如何快速求取空间点到STL模型表面有符号距离这一问题，提出一种基于线性八叉树的参考球方法。
For fast calculating the signed distance from spatial point to STL model, a reference ball method was put foward based on linear octree.
3
它的天文符号是，是希腊神话的海神波塞冬使用的三叉戟。
Its astronomical symbol is, a stylized version of the god Neptune's trident.
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