low-grade

adjective
🔊/ˌləʊ ˈɡreɪd/
🔊/ˌləʊ ˈɡreɪd/
[usually before noun]
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  1. of low quality质量差的;劣质的
  2. (medical医学) of a less serious type不太严重的;轻度的
    • a low-grade infection轻度感染