n.焦點(diǎn);聚焦
名詞focus的復(fù)數(shù)形式之一.
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(diǎn)的橢圓上圍繞太陽公轉(zhuǎn)。