- bottom hole scavenging
- bottom scavenging
- bottom-hole cleaning
- bottomhole scavenging
- 井底: shaft bottom; landing; pit b ...
- 清洗: wash; clean; rinse
- 彻底清洗: ri e thoroughly; rinse thoroughly
- 井底: [矿物学] shaft bottom; landing; pit bottom; gag
- 船底清扫费: graving expenses
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