侯怡

Have you ever dreamed of traveling in space？ Like most kids， when you look at the stars， youll imagine that you will be an astronaut1. It would be lots of fun to travel on a spaceship， just think about how wonderful it would be to stand on the moon or another planet！

你梦想过去太空旅行吗？和大多数孩子一样，当你仰望星空时，会想象自己是一名宇航员。乘坐宇宙飞船去外太空旅行会十分有趣，想想看，站在月球上或者其它星球上的感觉是多么美妙啊！

Of course， its not easy to become an astronaut. There arent many astronauts in the world， so you have to learn many skills in different areas. Astronauts have many skills so that they can be suitable2 to be traveling scientists beyond Earth.

当然，成为一名宇航员并不是件容易的事情。世界上的宇航员数量不多，所以你得学习不同领域的技能。宇航员拥有多种技能，这样他们才有资格成为地球外太空旅行的科学家。

Although it sounds like it would be great fun to travel to outer space， there would be a lot of work to do. You should take lots of preparation if you want to travel to outer space. Everything has to be planned carefully in advance. Why？ Because once you leave Earths surface， youll be all alone with the things you have in your spaceship. Theres no store to go to in space！

尽管去外太空旅行听上去很有意思，但是你得完成许多工作。如果你想去外太空旅行，那就要做许多准备，每件事都要提前仔细计划好。为什么呢？因为一旦你离开地球表面，就只能与你的行囊为伴。太空中可没有商店！

Once you are in space， nothing can enter the ship and nothing can go out. You must take everything you need to survive3 into outer space with you. Lets call these items “inputs4”. Inputs might include necessities such as food， water and oxygen.

一旦你待在太空中，就没有什么东西可以进出飞船。你必须把所有维持生命所需的东西带到太空中。我们称这些东西为“摄入物”，摄入物可以包括食物、水和氧气等必需品。

Now lets talk about “outputs5”. Every input creates an output. Lets say you open a box of Coco Comets cereal6 for breakfast. What will you do with the box when it is empty？ You only have so much room to store outputs on your spaceship. The garbage7 you create will be on the ship with you. Where will you store the garbage？

接下来我们谈谈“排泄物”。每种摄入物都会产生排泄物。比如说，你打开了一盒可可彗星牌的谷物作为早餐，如果盒子里的食物吃完了，你会怎么处理这个盒子？而你的宇宙飞船上只有那么点空间存放排泄物，你产生的垃圾只会和你一起留在宇宙飞船上。你会把这些垃圾放在哪里呢？

In order to survive， you must eat and drink， but this means your body will also turn these food and water into other forms8 of waste. Because nothing can leave the spaceship， you will need to think of a way to handle these bodily wastes. It might seem disgusting9， but this is an important question.

为了生存，你必须摄取食物和水，但是这就意味着你的身体会将这些食物和水转化成其它形式的垃圾。由于任何东西都不能离开宇宙飞船，你得想办法处理这些身体代谢产生的废物。这或许很恶心，但是个很重要的问题。

Even breathing creates an output—carbon dioxide！Do you know how to deal with the carbon dioxide？ Hint： Plants love carbon dioxide and depend on it. Also， plants output oxygen！ However， plants also have other input needs like water.

即使呼吸也會产生排泄物，那就是二氧化碳！你知道如何处理二氧化碳吗？给你个提示：植物喜欢二氧化碳并且依赖于它。同样地，植物也产出氧气！但是植物还需要其它的摄入物，比如水。

So， you have to plan for the trip to outer space very carefully. You have to think about all the things youll need， and you also have to consider what wastes these things will create.

所以说，你得仔细计划好外太空的旅行，还得想清楚所有需要的东西，以及这些东西会产生的废物。

Packing for a trip to outer space isnt a simple thing. It will take you time and energy. And you can start right now！Perhaps， you should make a plan that will have the least influence10 on the environment and your future.

去外太空旅行之前打包行李不是件容易的事。这需要时间和精力，而且你现在就要开始准备了！或许，你该先做个计划，这个计划对环境和你的未来的影响应该是最小的。