high-density downer 高密度下行床
density downer
唐纳密度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Dense phase in downer was much more difficult to observe than in riser due to its shorter duration time, smaller size and lower density.
通过比较高密度下行床与高密度提升管内密相特性，发现下行床内的密相因停留时间短、尺寸小和密度低而难以观察到。
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