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微课视频： 基数词: 序数词 one first two second three third four fourth five fifth six sixth seven seventh eight eighth nine ninth ten tenth eleven eleventh twelve twelfth thirteen thirteenth fourteen fourteenth fifteen fifteenth sixteen sixteenth seventeen seventeenth eighteen eighteenth nineteen nineteenth twenty twentieth thirty thirtieth forty fortieth fifty fiftieth sixty sixtieth seventy seventieth eighty eightieth ninety ninetieth hundred hundredth hundred-one hundred-first 两千 two thousand 一百万 one million 十亿 billion 第五课 Lesson five/( the Fifth Lesson) ０．７８ zero point seven eight ４５％ Forty-five percent 五分之一 one-fifth 五分之二 two-fifths |
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