如图所示，ansys中，通过布尔操作把中间的杆和外面的反相器减去螺旋体时，碰到如下错误，怎么解决？
topological degeneracy detected for VSBV command.Try modifying geometry slightly or loosening the tolerance (BTOL command) .If BTOL is relaxed,be sure to change the tolerance back to the default after operation.9要求是把中间的杆和外面的反相器减去螺旋体。
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