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TOEFL IELTS BNC: 15977 COCA: 13555
porous
adjective /ˈpɔːrəs/
  1. 1
    a porous substance has a lot of very small holes in it so that air and water can pass through it 多孔的;透水的;透气的
     Synonyms and related words
    Words used to describe properties of substances: absorbent, astringent, harsh...
  2. 2
    not effective in preventing people from attacking or escaping 多漏洞的;松懈的

    a porous border/defence 松懈的边界/防线

     Synonyms and related words
    Not effective or useful and not working correctly: useless, ineffective, inefficient...

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