self-propelling
(obsolete) The quality of being unavailing or unprofitable.
Not forming a lather.
(physics) Spacetime viewed on a quantum level, i.e. as a foam of randomly appearing and disappearing Planck-scale wormholes (black holes and white holes).
foam
Self-propelled.
自走式の掃除機は、散らかったリビングを驚くほど効率よく移動して掃除した。
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