The colours inside and on the outside of the building refer to the local natural colours of grass, sand and water.
内部颜色和建筑物的外部指的是草，沙子和水的地方自然色彩。
2
Radon from building materials such as granite, brick sand, cement and gypsum and the like, in particular, contain elements of natural stone and easy to release radon.
氡主要来自建筑材料，如花岗岩、砖砂、水泥及石膏之类，特别是含有放射性元素的天然石材，易释放出氡。
3
Natural resources as mineral water, clay, swell soil, peaty soil and buildingsand are also quite rich in amount.