第 4 课: 数字一到十-3
four, five, six 四,五,六
five, six, seven 五,六,七
six, seven, eight 六,七,八
one, two, three 一,二,三
one, two, three, four 一,二,三,四
one, two, three, four, five 一,二,三,四,五
one, two, three, four, five, six 一,二,三,四,五,六