... background activity level 本底放射性水平 ; 释义本底放射性水平 high background level 高本底水平 natural background level 自然基准 ...
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high level background 高背景
High Level Education Background 高等教育背景
·2,447,543篇论文数据，部分数据来源于NoteExpress
High level security checks on the background of the agents revealed "discrepancies" with what they told the TSA when they were hired.
BBC: Air marshals grounded over 'security'
When I was in junior high, public schools tolerated a much higher background level of bullying than they do in the post-Columbine era, but when I was at the Spelling Bee, I fit in.
CNN: National contest isn't bee-all and end-all
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