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怎么实现两个精灵被绳子链接在一起，而且拖拽其中一个，绳子会跟着变长
也就是说这个“绳子”其实没有起到限制的作用，更像是一条连接线，是不是类似这样：
@欧拉欧拉 对的，就是这样，怎么做出来的呀
@c空
