Any two places or regions that are on diametrically opposite sides of the earth.
对跖地,对踵点地球上处于正相对位置和两个地点或地区
I regret to say we're diametrically opposed to your ideas.
很遗憾我只好说我们完全不同意你们的意见。
A point on the celestial sphere directly below the observer, diametrically opposite the zenith.
天底天球上,在观测者垂直向下的一点,与天顶完全相对