Life on Other Planets

　　We don't know if there is life on other planets. Some people believe that there are only simple forms of life, like living cells. Others think that there may be plants or even animals. Still others imagine that there might be more complex and intelligent forms of life that are able to communicate with people on Earth. But these are just guesses. We really don't know if there is life on other planets or, if there is life, what it is like.

其他行星上的生命

　　我们不知道其它行星上是否有生命存在。有些人认为只有像生命细胞一样的简单的生命形式；另一些人认为可能有植物甚至动物；还有一些人想象可能有能与地球人交流的更为复杂的智力生命形式。但这些仅仅是猜测而已。我们并不真正知道其它行星上是否有生命形式存在，即使有，我们也不知道这种生命形式是什么样的。