例句與造句

1. laboratory equipment . enclosure for toxic using recirculating air filtration . general, classification, requirements
   實(shí)驗(yàn)室設(shè)備.循環(huán)空氣過濾出來的毒氣用封閉箱.總則分類和要求
2. It's difficult to find recirculating air in a sentence. 用recirculating air造句挺難的