background activity 背景活动 ; 后台活动
seismic activity background 地震活动背景
background equivalent activity 本底等效放射性 ; 本底等效活度
background activity level 本底放射性水平 ; 本底活度水平
BEA Background Equivalent Activity 本底当量放射性
background activity ratio 样品本底活性比
activity of background earthquake 本底地震活动
background seismic activity 背景地震活动性
Since the fundamental activity of developing software is writing code, these people tend to come from a development background.
由于软件开发中最基本的活动是编写代码，这些角色更倾向于拥有一定的开发背景。
You can use gateway form and activity form interchangeably for process models that contain only control flow, as we discussed in the Background section in Part 1 of this article.
流程模型中的网关形式和活动形式可以互换使用，如本文第1部分中的背景部分所述。
The budget came against the background of a sharp contraction in economic activity, far greater than that experienced in other euro-area countries.
这个预算的形成背景是，经济活动方面远超其他欧盟国家所经历过的大幅削减。
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