sill

• 名词，指基础或承重结构的水平底部构件，也指夹在沉积岩层之间的板状岩浆岩体。

A noun referring to a horizontal structural member forming the base of a framework or supporting structure, or a flat mass of igneous rock between layers of sedimentary rock.

1. Window sillA2formal

   The horizontal shelf or ledge at the bottom of a window frame, both inside and outside a building.

   窗台

   • She placed a potted plant on the kitchen window sill.
   • Rainwater collected on the outer sill of the window.
   • He sat on the wide window sill and read a book.

   同义词ledgeshelf

2. Structural timberC1formaltechnical

   A continuous horizontal timber forming the lowest member of a framework or supporting structure, such as in a door frame or the base of a wall.

   门槛

   • The carpenter replaced the rotted door sill with a new oak beam.
   • The building's foundation rests on a heavy timber sill.
   • A level sill is critical for the stability of the entire wall frame.

   同义词threshold

3. Geological sillC2formalscientific

   A flat, usually horizontal mass of igneous rock that has been injected between layers of older sedimentary rock.

   岩床

   • The Palisades in New Jersey are a famous example of a volcanic sill.
   • Geologists studied the exposed sill to understand the region's volcanic history.
   • The dark rock layer cutting across the lighter sandstone is a classic sill formation.