名词
中文翻译：背景活动
同义词：
['background noise', 'background radiation']
例句：
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1. The researchers found that the background activity in the area was significantly higher than expected.
研究人员发现该地区的背景活动明显高于预期。
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2. The study revealed that the background activity of the planet was not as stable as previously thought.
研究显示，这个星球的背景活动并不像之前认为的那样稳定。
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3. The scientists monitored the background activity of the sun to understand its impact on theEarth's climate.
科学家们监测太阳的背景活动，以了解其对地球气候的影响。