- perpetual motion machine of third kind
- 第三: third
- 永动机: perpetual motion machine
- 第二类永动机: perpetual motion machine of second kind; perpetual motion machine of the second kind; perpetuum mobile of the second kind
- 第一类永动机: perpetual machine of the first kind; perpetual motion machine of first kind; perpetual motion machine of the first kind; perpetuum mobile of the first kind
- 第三类: undergroundwalkways
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