A fulcrum is the point that a lever turns on, rests on, or is held up by while it lifts or moves something. A lever is just a bar. One part of the bar sits on something solid; that solid point is the fulcrum.

A fulcrum is the point that a lever turns on, rests on, or is held up byfulcrum是槓桿在移動或抬東西時，用來轉動、支撐、靠著的那個點 while it lifts or moves something在它抬起或移動東西的時候。 A lever is just a bar槓桿其實就只是一根桿子。 One part of the bar sits on something solid桿子的其中一部分會靠在一個固定的東西上; that solid point is the fulcrum那個固定的點就是fulcrum

The easy picture is a see-saw: the middle support is the fulcrum. When one child sits down, the other child goes up, because the bar turns on that point. In science class you use the same idea with a metal bar and weights.

The easy picture is a see-saw最簡單的畫面就是翹翹板: the middle support is the fulcrum中間那個支撐點就是fulcrum。 When one child sits down, the other child goes up一個小孩坐下去，另一個就會被抬起來, because the bar turns on that point因為那根桿子是繞著那個點在轉動。 In science class you use the same idea with a metal bar and weights在自然課裡你會用金屬桿和砝碼用到一樣的概念

Though actually, people also stretch the word in careful writing and news: they call an idea or a person “the fulcrum” when everything else turns on it. That use is more formal than playground talk.

Though actually不過其實, people also stretch the word in careful writing and news在正式的寫作和新聞裡，人們也會把這個字用得更廣一點: they call an idea or a person "the fulcrum" when everything else turns on it當所有事情都繞著某個想法或某個人轉的時候，就會稱那個為「the fulcrum」。 That use is more formal than playground talk這種用法比日常口語正式得多

The word was borrowed from Latin fulcrum, a bedpost or the foot of a couch, from fulciō, “to prop up, to support.”

The word was borrowed from Latin fulcrum這個字是從拉丁文fulcrum借來的, a bedpost or the foot of a couch原意是床柱或沙發的腳, from fulciō, "to prop up, to support."來自fulciō，意思是「撐住、支撐」