window-sill

基本解释

He neatly aligned the flower-pots on the window-sill.
他整齐地把花盆一字排在窗台上。
His hands were black and his long tail hung over the window-sill into the room.
他的双手是黑色的，他的长尾巴挂在窗台上方，伸到房间里来。
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Whether you've got a balcony, terrace, window-sill or garden, you need to make sure that the space is suitable for growing plants.
不管你拥有的是阳台、露台、窗台还是花园，你需要确保你的空间适合种植植物。

Both the front and rear set the tone for the vehicle's width, which comes courtesy of the wide, prominent grille and headlamps extending into the vehicle sides, as well as the wide rear window, two-piece rear lamp cluster and the large tailgate with low boot sill.
ENGADGET: Mercedes-Benz introduces B-Class Electric Drive, we go eyes-on
On the only side street, I found a house that might have belonged to him—a stucco-covered house, with a dormer window above the front door, books stacked on the sill of that window.
NEWYORKER: Amundsen

A windowsill is a shelf along the bottom of a window, either inside or outside a building.