twenty+(one two three four five six seven eight nine) 20-(21至29)
thirty+(括号内同上) 30-(31至39)
forty 40
上述“前面一个单词+(内容)”在后面对应括号里面的数
twenty+(one two three four five six seven eight nine) 20-(21至29)
thirty+(括号内同上) 30-(31至39)
forty 40
上述“前面一个单词+(内容)”在后面对应括号里面的数