bottom composition meaning in English

船底涂料

Step 2 : control your descent to keep from colliding with life - covered reefs and to limit stirring bottom composition
第二步：控制自己的下降，不要碰撞表面覆盖生物的暗礁，减少对水底物质的搅动。
3 , logging curve comparison results show that in the west part of south region there is a grade 4 normal fault , and the separation is 4 - 6 meters . five microstructure types and 8 top and bottom composition patterns have been proposed . the relationship between microstructure and deposition facies was studied and the genesis relationship was confirmed , that is , top microstructure is mainly corresponding to nature levee , contrasting to that of the bottom microstructure
提出了五种微构造类型及八种顶底微构造组合模式；并研究了微构造与沉积相的关系，发现它们之间存在一定的成因联系，即顶面微构造中高点、鼻状和断鼻构造主要对应于边滩微相，低点与沟槽微构造则主要对应于天然堤微相，而底面微构造正好与之相反。