单词	backsword
释义	backsword noun back·​sword ˈbak-ˌsȯrd  : a single-edged sword Word History First Known Use 1597, in the meaning defined above
随便看	opry OPS ops opses opsimath opsimaths opsin opsins opsiometers opsisform opsistype opsomaniacs opson- opsonic pressure distillate pressure element pressure fan pressure filter pressure flaking pressure gauge pressure glide pressure gradient pressure group pressure groups pressure gun

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