1~10,12~20,30~39的基数词,序数词,缩写答:序数词缩写:1st , 2nd , 3rd , 4th , 5th , 6th, 7th , 8th ,9th ,10th 2、12~20 基数词:12 twelve 13 thirteen 14 fourteen 15 fifteen 16 sixteen 17 seventeen 18 eighteen 19 nineteen 20 twenty 序数词及缩写:第12 twelfth 12th、第13 thirteenth 13th、第14 fourteenth 14th、第15...