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Lk uoy oD .sewtamssalc uro yb detcelloc seurtci het tap koonoenok uy oD .swtamssalc uro ybo detcelloc seurcip het ta kootL eman eht eman eht
oempuiqe eseht fntntempuiqe eseht fo ？test tube tongs balancetest tube tongs balancecrucible beaker & glass rod Bunsen burner crucible beaker & glass rod Bunsen burner ？


SinceSince you are interested in doing scientific experiments, now let’s get to know some vocabulary and you are interested in doing scientific experiments, now let’s get to know some vocabulary and knowledge related to science and experiment.knowledge related to science and experiment.PotassiumPotassium
）钾（What can it be used for?What can it be used for?
（钾）


How about the following metals?How about the following metals? SodiumSodium((
钠)) CalciumCalcium((
钠
钙)) MagnesiumMagnesium((镁))Let’s get to know more!Let’s get to know more!
钙镁


Let’s go on getting Let’s go on getting to know more metalsto know more metalsAluniniumAluninium
（铝）（铝）（铁）（铁）
（铜）
（铜）
nor（锌） IronI）锌（
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先说几百，再加and,and,再加末两位数（或末位数）。如：再加末两位数（或末位数）。如：223— 223— 416— 416— 809— 809— twenty-threetwenty-three eighty-nineeighty-ninetwo hundred and twenty-threetwo hundred and twenty-threefour hundred and sixteenfour hundred and sixteeneight hundred and nineeight hundred and nine
先说几百，再加“”
先说几十，再说几，中间用连字符。如：23— 89—23— 89—B. B. “”
先说几十，再说几，中间用连字符。如：“” “”
1.1.基数词的读法：基数词的读法：A. A. “” “”


以上的数先从后向前数，每三位数加一,”,”“千分位）；第一个（,”,”号前为号前为thousand; thousand; “
“上的数先从后向前数，每三位数加一以（千分位）；第一个“
” ;n第二个,o,”号前为号前为lmillion; mili““个二第前llim第三个,”,”号i为号前为billionbillion。。如：如：1,001— 1,001— 4,000— 4,000— 9,743— 9,743— 174,301—174,301—750,000,000— 750,000,000— one thousand and oneone thousand and onefour thousandfour thousandnine thousand, yeven hundred and forty-threenine thousand, seven hundred and forty-threea (one) hundred and seventy-four thousand, three hundred and a (one) hundred and seventy-four thousand, three hundred and oneoneseven hundred and fifty millionseven hundred and fifts on个三第“
C. 1000C. 1000“


Can you say the following in English correctly?Can you say the following in English correctly?1,000 1,000 2,000 2,000 12,000 12,000 112,000112,000796,000796,000oneone thousandthousandtwo thousandtwo thousandtwelvetwelve thousandthousandone hundred,twelve thousandone hundred,twelve thousandseven hundred, ninety six thousandseven hundred, ninety six thousand


879,457879,457eight hundred, seventy-nine thousand, four hundred and fifty-seveneight hundred, seventy-nine thousand, four hundred and fifty-seven 1,000,000 1,000,000 9,000,0009,000,00032,000,000 32,000,000 212,000,000212,000,000one million one million nine millionnine millionthirty-two millionthirty-two milliontwo hundred, twelve milliontwo hundred, twelve million


988,766,688988,766,688nine hundred, eighty-eight million, seven hundred, sixty-six thousand, nine hundred, eighty-eight million, seven hundred, sixty-six thousand, six hundred and eighty-eightsix hundred and eighty-eight987,654,321987,654,321nine hundred, eighty-seven million, six hundred, fifty-four nine hundred, eighty-seven million, six hundred, fifty-four thousand, three hundred and twenty-onethousand, three hundred and twenty-one


1,000,000,0001,000,000,000one billionone billion9,000,000,0009,000,000,000nine billionnine billion32,000,000,00032,000,000,000thirty-twothirty-two billionbillion564,865,000,000564,865,000,000five hundred, sixty-four billion, eight hundred, sixty-five millionfive hundred, sixty-four billion, eight hundred, sixty-five million


978,876,675,467978,876,675,467nine hundred, seventy-eight billion, eight hundred, nine hundred, seventy-eight billion, eight hundred, seventy-six million, six hundred, seventy-five thousand, seventy-six million, six hundred, seventy-five thousand, four hundred and sixty-sevenfour hundred and sixty-seven


（第十），但下面这些基数词在变序数词时，有特别的地方。如：如：A.A. one — two — one — two — three— five— three— five— eight — nine— eight — nine— twelve—twelve—firstfirstsecondsecondthirdthirdfifthfiftheightheighthninthninthtwelfthtwelfth
（第十），但下面这些基数词在变序数词时，有特别的地方。
2.2.序数词的读法序数词的读法序数词一般以与之相应的基数词加词尾序数词一般以与之相应的基数词加词尾-th-th构成，如：构成，如：tenthtenth


B. B. 以以-ty-ty结尾的词，要先变结尾的词，要先变-y-y为为-i-i，再加，再加-eth-eth。如：。如：twenty—twenty— forty— forty—C. C. 以以one, two, three, five, nineone, two, three, five, nine收尾的多位数词，要照第一条方法变。如：收尾的多位数词，要照第一条方法变。如：twenty-one— twenty-one— twenty-two — twenty-two — thirty-five — thirty-five — ninety-nine—ninety-nine—a hundred and fifty-three — a hundred and fifty-three — twentiethtwentiethfortiethfortiethtwenty-firsttwenty-firsttwenty-secondtwenty-secondthirty-fifththirty-fifthninety-ninthninety-nintha hundred and fifty-thirda hundred and fifty-third


基数词表示分子，序数词表示分母，除了分子是1”1”的情况外的情况外，序数词要用复数。如：，序数词要用复数。如：¼— 2/3— ¼— 2/3— 7/9— 5/12— 7/9— 5/12— — — — —one-fourthone-fourthtwo-thirdstwo-thirdsseven-ninthsseven-ninthsfive-twelfthsfive-twelfthstwo and three-fifthstwo and three-fifthsthirty and seven-eighthsthirty and seven-eighths3.3.分数词的读法分数词的读法22335530307788
基数词表示分子，序数词表示分母，除了分子是“
“


一些特殊的表达法一些特殊的表达法½— ½— ¼—¼—¾— ¾— a / one halfa / one halfa / one