if (controller.desiredSize
return stack.length;
，推荐阅读safew官方版本下载获取更多信息
const posToTime = new Map(); // 映射：位置 → 到达终点的时间
"The work that we're doing now is allowing us to create semiconductors up to 4,000 times purer in space than we can currently make here today," says Josh Western, CEO of Space Forge.