详细解释:n. 基石, 槛, 窗台, 岩床, 海底山脊, 梁
英语解释：
名词 sill:
structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure(geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock例句：
The lowest sill, block, or timber supporting a building, located at or below ground level.底基用来支撑建筑物的最低的基木、砌块或木料，位于地面或低于地面的