Why Do Astronauts Wear Space Suits?为什么航天员要穿宇航服？

Space suits dont just make astronautslook cool. Without these special suits，astronauts wouldnt be able to leave theirspacecraft. Space is a dangerous placefor human beings. Firstly， there is no air tobreathe. Secondly， space also has highlevels of radiation， energy that can passthrough our bodies and make us sick.Thirdly， some parts of space are really coldwhile other parts are very hot. So astronautscould die in just a few seconds if theystepped outside their spacecraft without theirsuits. With a space suit， though， astronautscan move around in space for several hours.

宇航服不只是让航天员看起来很酷。如果没有这些特殊的装备，航天员将无法离开他们的宇宙飞船。太空对人类来说是一个危险的地方。首先，太空没有可以呼吸的空气。其次，太空有高水平的辐射，这种能量可以穿过我们的身体，让我们生病。再次，太空的某些地方非常冷，有的地方又非常热。如果航天员不穿宇航服走出飞船，他们可能会在几秒钟内死亡。穿着宇航服的航天员可以在太空中行走好几个小时。

Space suits keep astronauts safelysealed inside. A backpack sends O2 in to letastronauts breathe normally. At the sametime， the CO2 that astronauts breathe out issucked away. The suit also protects themfrom harmful radiation and fast-movingspace dust. Under the space suit is anothersuit that looks like a pair of tight pajamaswith little pipes running through them. Waterruns through these pipes to cool offastronauts because wearing a space suitcan make astronauts very hot！

宇航服將航天员安全地密封在衣服里。背包将氧气送入，让航天员能正常呼吸。同时，航天员呼出的二氧化碳可以被吸走。该装备还可以保护航天员免受有害辐射和快速移动的太空尘埃的伤害。宇航服里面是另一套衣服，看起来像一套紧身睡衣，衣服里有很多小管子。水通过这些小管子为航天员降温，因为穿着宇航服会使航天员变得非常热！

Word Bank

spacecraft n. 宇宙飞船

radiation n. 辐射；放射线

seal v. 密封

suck v. 吮吸；吸

pajamas n. （一套）睡衣裤