单词：oxygen enrichment
oxygen enrichment的用法和样例：
例句
- Membrane technology of oxygen enrichment has been widely used for combustion assistance.摘要膜法富氧及其助燃技术的应用非常广泛。
- However, direct use of oxygen, or enrichment of the air with oxygen, is necessary for some processes.但是对于某些过程，直接使用氧或富氧空气是必要的。
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