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Science fiction writers have often imagined human beings going to live on Mars. But these days, scientists are taking the idea seriously. It has a great deal to recommend it, since it might solve the problem of overcrowding on the earth. But obviously, it would not be worth making the effort unless people could live there naturally. If the atmosphere were like that of the earth, this might be possible. But in fact it is mostly carbon dioxide. Apart from that, there are other problems to be overcome. For example, the temperature would have to be raised from 60 degrees below zero to 15 degrees above it. |
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kē huàn zuò jiā jīng cháng huàn xiǎng rén lèi zài huǒ xīng shàng shēng huó. dàn rú jīn, kē xué jiā kāi shǐ rèn zhēn kàn dài zhè gè wèn tí le. zhè shì fēi cháng zhí de tuī jiàn de, bì jìng zhè yǒu kě néng jiě jué dì qiú xiàn zài rén kǒu guò duō de wèn tí. bù guò hěn xiǎn rán, chú fēi rén men néng zì rán dì zhù zài na r, bù rán jiù bù zhí de wèi zhī nǔ lì le. rú guǒ huǒ xīng dà qì céng hé dì qiú dà qì céng xiāng lèi sì, nà me zhè jiù shì yǒu kě néng de. kě shì shì shí shàng huǒ xīng dà qì céng jī běn dōu shì èr yǎng huà tàn. chú cǐ yǐ wài, hái yǒu qí tā xū yào kè fú de wèn tí. bǐ rú, nà ér de wēn dù néng cóng líng xià 60 dù yī zhí dào líng shàng 15 dù. |