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
The conditioned response, once it is firmly established, can be extinguished dozens of times, but it sill always return, like the proverbial bad penny.
条件反射一经形成，虽然可以一次又一次地压制下去，但是它总会重新再现，真是摆也摆不脱扔也扔不掉。
A thin plank fastened to the side of a boat or to the sill of a port to keep out the sea and the spray.
挡水板，防浪板缚于船边或港基的薄木板。用来阻挡海水及其喷溅
