30的缩写【序数词】要正确的哦!

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)
twenty-first (21st)
twenty-second (22nd)
twenty-third (23rd)
twenty-fourth (24th)
twenty-fifth (25th)
twenty-sixth (26th)
twenty-seventh (27th)
twenty-eighth (28th)
twenty-ninth (29th)
thirtieth (30th)