- 未: did not; have not
- 硫化: vulcanization; vulcanizing
- 的: 4次方是 The fourth power of 2 i ...
- 未硫化橡胶: half finished rubber; unvulcanized rubber
- 硫化的: sulfurated; sulfureted; sulfuretted; sulphureted; sulphuretted; vulcanized; vulcanizing
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