Cách sử dụng
The word sill means the flat base of a window or a door frame which is usually made of wood, metal or concrete. It is used to support the weight of the window or door and to prevent it from falling out of the wall. The word sill can also refer to the bottom part of a rock formation or a cliff, which is often used for people to sit on or for animals to rest. In general, the word sill is used to describe the flat surface at the bottom of an opening or a structure that provides support or a resting place.