A beam that is held firmly at one end only, so the rest of it reaches out into empty space with nothing underneath holding it up. That is the whole idea: support at one end, air at the other.

A beam that is held firmly at one end only一根只有一端被牢牢固定住的樑， so the rest of it reaches out into empty space其餘的部分向空中延伸出去， with nothing underneath holding it up下面沒有任何東西撐著 That is the whole idea這就是整個概念： support at one end, air at the other一端有支撐，另一端則懸空

It is how a balcony hangs off the side of a building, how a shelf can appear to float on a wall, how a diving board springs, and how some large bridges are built out from each side until the two arms meet.

It is how a balcony hangs off the side of a building陽台能懸掛在建築物側邊， how a shelf can appear to float on a wall層架能看起來像浮在牆上， how a diving board springs跳水板能有彈性， and how some large bridges are built out from each side until the two arms meet有些大橋也是從兩邊往中間建，直到兩端接起來——靠的都是這個原理

Engineers and architects use it constantly, and it works as a noun (the roof rests on two cantilevers) and as an adjective before another noun (a cantilever bridge, a cantilever chair). It is also a verb: the balcony is cantilevered out over the street.

Engineers and architects use it constantly工程師和建築師常常用這個字， and it works as a noun (the roof rests on two cantilevers)可以當名詞（the roof rests on two cantilevers，屋頂靠兩根懸臂支撐）， and as an adjective before another noun (a cantilever bridge, a cantilever chair)也可以放在名詞前面當形容詞（a cantilever bridge懸臂橋、a cantilever chair懸臂椅） It is also a verb也可以當動詞： the balcony is cantilevered out over the street例如the balcony is cantilevered out over the street（陽台以懸臂方式伸出到街道上方）

It is a technical word, but a common enough one that people describing buildings and furniture will use it.

It is a technical word這是個專業字眼， but a common enough one that people describing buildings and furniture will use it但常見到形容建築和家具的人都會用到