| 词汇 | ultra-clean | 
| 释义 | ultra-clean  adjective (also ultraclean) uk/ˌʌl.trəˈkliːn/ us/ˌʌl.trəˈkliːn/  超净 extremely clean  Ultra-clean children, some believe, are more likely to suffer from allergies.  The samples are analysed in ultraclean laboratories.  样本在超净实验室中进行分析。  
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