On another planet 在另一个世界
　　如果形容一个人是在另一个世界，那就表示这个人对眼前的事情心不在焉，漠不关心。
　　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：
　　如果说一个人living on another planet那么意思就是说这个人一点都不现实。
　　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!
　　常识补充：
　　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.
　　地球是太阳系的一部分。太阳的核心是整个太阳系动力的源泉。八大行星围绕着太阳，分别是：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，现在被认为是矮行星。

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