variation rules的用法和樣例：
例句
- At the end of paper, the mechanisms of UHI's variation are also explored.
最后對熱島變化規律的成因進(jìn)行了初步分析。 - 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。
