国内外研究认为，无菌松动的原因分两大类，力学因素和生物因素，例如应力遮挡和磨损微粒碎屑等。
Many researchers consider that both the mechanics and the biology factors can cause the loosening, for example, the stress shielding and wearing chippings.
广西沿海主要岛屿区海滩沉积物分为砾质沉积、砂质沉积、生物碎屑沉积。
Seabeach sediment on the main island area of Guangxi coast can divided into gravelly, sandy, bioclastic deposition.
托索湖—花石峡礁带的主体由块状的礁相灰岩和生物碎屑灰岩所组成；
The reef island belt from Tusuo Lake to Huashixia is mainly composed of massive reef limestone and bioclastic limestone.
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