至20基数词依次是:
one ,two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen ,sixteen, seventeen, eighteen, nineteen, twenty。
1至20序数词依次是:
first (1st) ,second (2nd),third (3rd) ,fourth (4th) ,fifth (5th) ,sixth (6th) ,seventh (7th) ,eighth (8th) ,ninth (9th) ,tenth (10th) ,eleventh (11th) ,twelfth (12th)。
thirteenth (13th) ,fourteenth (14th) ,fifteenth (15th) ,sixteenth (16th) ,seventeenth (17th) ,eighteenth (18th) ,nineteenth (19th) ,twentieth (20th)。
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