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先对路过的大佬表示下感谢! 我看到不同算例中使用约束有constraints和restraints两种不同关键字,它们有区别吗?其中fixedPoint和fixedLine能理解,但fixedAxis代表什么呢?另外,我模拟的是浮体在水面上自由漂浮,不受约束,设置时直接将这个关键字删除了,但是运行过程发现浮体不动了,这是怎么回事呢?