- 专业: specialized subject; special ...
- 级: level; rank; grade
- 四冲程: four-stroke-cycle
- 四冲程: [机械工程] four-stroke-cycle◇四冲程发动机 four-cycle engine; four-stroke engine; four-stroke cycle engine; otto engine; 四冲程内燃机 four-stroke internal combustion engine; 四冲程循环 four-stroke cycle
- 专业级: expert; wella system professional
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