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