In science（科学）/ˈsaɪəns/ class（课；班级）/klɑːs/, Ms Zhao placed（放置）/pleɪst/ two glass（玻璃；玻璃制的）/ɡlɑːs/ cups（杯子）/kʌps/, a bag（袋子）/bæɡ/ of sugar（糖）/ˈʃʊɡə/, a spoon（勺子）/spuːn/, and a thermometer（温度计）/θəˈmɒmɪtə/ on each table（桌子；表格）/ˈteɪbl/. “Today（今天）/təˈdeɪ/ we will find out（查明；弄清）/faɪnd aʊt/ whether（是否）/ˈweðə/ sugar dissolves（溶解）/dɪˈzɒlvz/ faster（更快地；更快的）/ˈfɑːstə/ in warm（温暖的）/wɔːm/ or cold（冷的；冷水中的）/kəʊld/ water（水）/ˈwɔːtə/. You will work in groups（分组合作）/wɜːk ɪn ɡruːps/ and take notes（记笔记）/teɪk nəʊts/.”

Mia and Sam filled（装满；填充）/fɪld/ the first cup with water at twenty degrees（度；程度）/dɪˈɡriːz/ and the second（秒）/ˈsekəndz/ cup with water at fifty degrees. They added（添加）/ˈædɪd/ one spoonful（一勺的量）/ˈspuːnfʊl/ of sugar to each cup and mixed（混合；搅拌）/mɪkst/ both at the same（相同的）/seɪm/ speed（速度）/spiːd/. Sam watched（注视；观看）/wɒtʃt/ the clock（钟；计时钟）/klɒk/ and recorded（记录）/rɪˈkɔːdɪd/ the time（时间；计时）/taɪm/. Their result（结果）/rɪˈzʌlt/ surprised（使吃惊；感到吃惊的）/səˈpraɪzd/ them: the sugar in the cold water seemed（似乎）/siːmd/ to dissolve in 35 seconds, while（而；当……时）/waɪl/ the warm water needed（需要）/ˈniːdɪd/ seventy seconds.

Mia decided to ask a question（提问）/ɑːsk ə ˈkwestʃən/. “Does sugar dissolve faster in warm water? Why did our table show the opposite（相反的结果）/ˈɒpəzɪt/?” Ms Zhao did not answer（回答）/ˈɑːnsə/ the question（问题；提问）/ˈkwestʃən/ at once（一次；一旦）/wʌns/. “Check（检查）/tʃekt/ every step（步骤；步）/step/ and every note（笔记；记录）/nəʊts/ carefully（仔细地）/ˈkeəfəli/.” Mia compared（比较）/kəmˈpeəd/ the cups with Sam's table. The temperatures（温度）/ˈtemprətʃəz/ were correct（正确的；改正）/kəˈrekt/, but the two times were under the wrong（错误的）/rɒŋ/ cup names（名称；名字）/neɪmz/.

Sam pointed（指向）/ˈpɔɪntɪd/ to his notes. “I made a mistake（犯了一个错误）/meɪd ə mɪˈsteɪk/ when（当……时；什么时候）/wen/ I copied（抄写；复制）/ˈkɒpid/ the numbers（数字）/ˈnʌmbəz/.” Ms Zhao asked the group（小组）/ɡruːps/ to repeat（重复；重做）/rɪˈpiːt/ the test（测试；实验）/test/. This time, Mia read（读出；阅读）/red/ each cup name aloud（大声地）/əˈlaʊd/ before（在……之前）/bɪˈfɔː/ Sam wrote（写下）/rəʊt/. “The sugar is dissolving quickly in the warm water.” The sugar in warm water dissolved in 18 seconds; the sugar in cold water needed 43 seconds.

The students（学生）/ˈstjuːdənts/ corrected their table and added one sentence（句子）/ˈsentəns/ about the recording error（错误；差错）/ˈerə/. They then（然后）/ðen/ used（使用）/juːzd/ the new（新的）/njuː/ result to answer the first question（回答问题）/ˈɑːnsə ðə fɜːst ˈkwestʃən/ and handed in（上交）/ˌhændɪd ˈɪn/ a short（短的；简短的）/ʃɔːt/ report（报告）/rɪˈpɔːt/. Ms Zhao checked it. “Now your report shows the test, the mistake（错误）/mɪˈsteɪk/, and the correction（修正；改正）/kəˈrekʃn/. Another（另一个）/əˈnʌðə/ group can follow（按照；跟随）/ˈfɒləʊ/ it and get（得到；获得）/ɡet/ the same result.”