On another planet 在另一個(gè)世界
　　如果形容一個(gè)人是在另一個(gè)世界，那就表示這個(gè)人對(duì)眼前的事情心不在焉，漠不關(guān)心。
　　例句：
　　Jane's on another planet ? she went to buy some apples and bought lemons instead!
　　John really doesn't listen in class; he seems to be on another planet.
　　注意：
　　如果說(shuō)一個(gè)人living on another planet那么意思就是說(shuō)這個(gè)人一點(diǎn)都不現(xiàn)實(shí)。
　　例句：
　　He thinks we'll be able to drive to Paris by tonight ? he's really on another planet!
　　If she thinks we can afford a two-week holiday in Spain she's living on another planet!
　　常識(shí)補(bǔ)充：
　　Earth is part of the solar system. Our sun's core provides the power. It is surrounded by eight planets: Mercury, Venus, Earth, Mars, Jupiter, Neptune, Uranus and Saturn. Pluto lost its planet status in 2006 and is now considered to be a dwarf planet.
　　地球是太陽(yáng)系的一部分。太陽(yáng)的核心是整個(gè)太陽(yáng)系動(dòng)力的源泉。八大行星圍繞著太陽(yáng)，分別是：水星，金星，地球，火星，木星，海王星，天王星和土星。在2006年冥王星失去了行星的地位，現(xiàn)在被認(rèn)為是矮行星。

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