单词：ultra-clean
ultra-clean的用法和样例：
例句
- Put the article and culture needed on the ultra.把接种所需要的物品和培养基在超净工作台上摆好。
- Clean Bench length of life related to the degree of air cleanliness.超净台使用寿命的长短与空气的洁净程度有关。
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