- rough pump
- 初步: initial; first step; prelimi ...
- 初步抽气泵: backing pump; rough pump
- 抽气机: air exhauster; air extracting pump; air extractor; air pump; air-bleed set; air-ejecting fan; air-extractor; aspirator; deaerator; exhaust blower; exhaust fan; exhaust unit; exhausting machine; suction gas engine; vacuum fan
- 初步抽样单位: primary sampling unit
- 机械初步抽空泵: mechanical roughening pump; mechanical roughing pump
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