需氧量 oxygen demand
oxygen requirement
demand for oxygen
- 主要污染指标是氨氮和生化需氧量。
The key pollution indicators are ammonia nitrogen and BOD. - 「化学需氧量」是用以量度污水的浓度。
The COD value is a measure of the effluent strength. - 运用减低心跳至每分钟四次和减少需氧量来做到这一点。
It does so by slowing its heart to four beats a minute and so reducing its oxygen needs.