| A | 大家看，这4瓶气体是氢气、氧气、一氧化碳和二氧化碳，可是没有标签，我们该怎么鉴别？ |
| dàjiā kàn, zhè sì píng qìtǐ shì qīngqì, yǎngqì, yīyǎnghuàtàn hé èryǎnghuàtàn, kěshì méiyǒu biāoqiān, wǒmen gāi zěnme jiànbié? |
| Look, everyone. These four vials of gas hold hydrogen, oxygen, carbon monoxide, and carbon dioxide. But they aren't labeled, so how do we distinguish them? |
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| B | 老师老师，氧气可以用带火星的木条检验。 |
| lǎoshī lǎoshī, yǎngqì kěyǐ yòng dài huǒxīng de mùtiáo jiǎnyàn. |
| Teacher, teacher! Oxygen can be tested with a glowing splint. |
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| C | 也能用燃着的木条，氧气可以使木条越烧越旺。 |
| yě néngyòng ránzháo de mùtiáo, yǎngqì kěyǐ shǐ mùtiáo yuè shāo yuè wàng. |
| You can also use a burning splint. The oxygen will make the splint burn brighter and brighter. |
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| B | 二氧化碳能使澄清的石灰水变浑浊。 |
| èryǎnghuàtàn néng shǐ chéngqīng de shíhuīshuǐ biàn húnzhuó. |
| Carbon dioxide makes clear limewater turn murky. |
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| D | 一氧化碳和氢气能被点燃。 |
| yīyǎnghuàtàn hé qīngqì néng bèi diǎnrán. |
| Carbon monoxide and hydrogen are combustible. |
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| A | 大家说得都很好，那我们来制定一个实验步骤。 |
| dàjiā shuō de dōu hěn hǎo, nà wǒmen lái zhìdìng yī ge shíyàn bùzhòu. |
| You all answered very well. Now let's plan out the steps of the experiment. |
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| B | 先检验氧气！ |
| xiān jiǎnyàn yǎngqì! |
| Test for oxygen first! |
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| C | 先检验二氧化碳！ |
| xiān jiǎnyàn èryǎnghuàtàn! |
| Test first for carbon dioxide! |
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| A | 好了，别争了，大家分组做吧。 |
| hǎo le, bié zhēng le, dàjiā fēnzǔ zuò ba. |
| OK, don't argue. Everyone, break into groups. |
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| B | 陈磊，你说先检验什么？ |
| Chén lěi, nǐshuō xiān jiǎnyàn shénme? |
| Chen Lei, what will you test for first? |
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| D | 先检验二氧化碳吧！快拿4根试管出来，倒入澄清的石灰水。 |
| xiān jiǎnyàn èryǎnghuàtàn ba! kuài ná sì gēn shìguǎn chūlai, dàorù chéngqīng de shíhuīshuǐ. |
| Let's first test for carbon dioxide! Quick, get out four test tubes, and pour in the settled limewater. |
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| B | 这瓶是二氧化碳！ |
| zhè píng shì èryǎnghuàtàn! |
| This bottle has carbon dioxide! |
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| C | 陈磊，给你，燃着的木条！ |
| Chén Lěi, gěi nǐ, ránzháo de mùtiáo! |
| Chen Lei, here you go, a glowing splint! |
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| B | 咦，这两瓶都点燃了。那我们怎么知道哪瓶是氢气哪瓶是一氧化碳啊？ |
| yí, zhè liǎng píng dōu diǎnrán le . nà wǒmen zěnme zhīdào nǎ píng shì qīngqì nǎ píng shì yīyǎnghuàtàn a? |
| Oh, both of these bottles ignited. So, how will we know which one is hydrogen and which is carbon monoxide? |
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| D | 别急，看我的！好了！这个是一氧化碳！ |
| bié jí, kànwǒde! hǎo le! zhè ge shì yīyǎnghuàtàn! |
| Don't rush, look at mine! OK, this one is carbon monoxide! |
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| B | 老师，我们鉴别出来了！ |
| lǎoshī, wǒmen jiànbié chūlái le! |
| Teacher, we've figured out which is which! |
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| A | 好，那我们请陈磊同学说说他们的实验步骤。 |
| hǎo, nà wǒmen qǐng Chén Lěi tóngxué shuō shuo tāmen de shíyàn bùzhòu. |
| Good. So let's ask Chen Lei to say a bit about the steps of his experiment. |
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| D | 先用澄清的石灰水检验出二氧化碳，然后用燃着的木条，然后，嗯…... |
| xiān yòng chéngqīng de shíhuīshuǐ jiǎnyàn chū èryǎnghuàtàn, ránhòu yòng ránzháo de mùtiáo, ránhòu, ng4...... |
| First, use the settled limewater to test for carbon dioxide, then use the burning splint, then...ah... |
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| B | 让徐晓婷说吧，陈磊嘴笨，会做不会说。 |
| ràng Xú Xiǎotíng shuō ba, Chén Lěi zuǐ bèn, huì zuò bùhuì shuō. |
| Let's have Xu Xiaoting speak. Chen Lei is not very articulate, he can do it but can't talk about it. |
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| C | 能使燃着的木条越烧越旺的是氧气，被点燃的是氢气和一氧化碳。然后再用澄清的石灰水检验燃烧生成的气体。因为一氧化碳燃烧会生成二氧化碳。 |
| néng shǐ ránzháo de mùtiáo yuè shāo yuè wàng de shì yǎngqì, bèi diǎnrán de shì qīngqì hé yīyǎnghuàtàn. ránhòu zài yòng chéngqīng de shíhuīshuǐ jiǎnyàn ránshāo shēngchéng de qìtǐ. yīnwèi yīyǎnghuàtàn ránshāo huì shēngchéng èryǎnghuàtàn . |
| The one that can make the wooden splint burn brighter and brighter is oxygen. The ones that ignited were hydrogen and carbon monoxide. Afterward, use the settled limewater again to test the gas produced by the burning. Because carbon monoxide produces carbon dioxide when burned. |
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| A | 很好，今天的实验很成功，下课以后，请大家认真填写实验报告。 |
| hěnhǎo, jīntiān de shíyàn hěn chénggōng, xiàkè yǐhòu, qǐng dàjiā rènzhēn tiánxiě shíyàn bàogào. |
| Very good. Today's experiment was a big success. After class, please carefully fill in your experiment reports. |
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