radon concentration的用法和樣例：
例句
- The variation rules of Rn concentration in the soil of the groundwork in Chengdu area is discussed from different angles.
本文就成都地區地坪基礎的施工中氡濃度的變化規律作一初步探討。 - In this study,indoor radon consistence in some buildings in Beijing was measured with activated carbon box method.
采用活性炭盒法測定北京地區部分居民住宅內的氡濃度。
