常见例句用作名詞 (n.)We put the cage in one of the field's foci.我們把籠子放在區域中的一個焦點処。The earth revolves around the sun in an ellipse with the sun at one of the foci.地球在以太陽爲焦點的橢圓上圍繞太陽公轉。 返回 foci