B 开头单词
be nothing difficult 不在话下
be noted for 以…而闻名
be noted as 以…而闻名
be not worth a smile 不值一笑
be not worth a penny 一钱不值
be not up to much [经济学]不是怎样了不起的东西
be not supposed to 不应该 没料到 不得
be not qualified to 没有资格(qualified是qualify的过去分词) 不能胜任(qualified是qualify的过去分词) 不配(qualified是qualify的过去分词)
be not in 不在家
be not found [医药科学]未引出
be not afraid of 不畏惧 不怕
be not accommodating 不知机变