This is called natural background radiation.
这称为自然环境辐射。
These natural "background" doses vary throughout the country.
这些天然的“背景”的辐射有地域差别。
Ambiguity in language is a natural phenomenon due to different thinking mode and cultural background.
语言的歧义问题是一个自然现象，这是由于思维方式、文化背景的不问造成的。
It is introduced from the natural environment, socio-economic background and cultural backgrounds.
本文分别从自然环境、社会经济背景和文化背景介绍了景区概况。
That is the background of natural disasters emergency logistics emerges.
这就是自然灾害应急物流产生的背景。
That is the background of natural disasters emergency logistics emerges.
这就是自然灾害应急物流产生的背景。
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