train grade happy play中的ai a a ay哪个发音不同

train grade happy play中的ai a a ay哪个发音不同 grade Grade Danny is so happy that he looks( )on the train. train train train 关于数据库Oracle的一道题a.course=b.能通俗点解析吗?select courseid as 课程ID,course as 课程名称,nvl(avg(grade),0) as 平均成绩,(select count(grade) from train a where grade 将含有与pl（ay）画括号部分相同读音的单词写在一起.hat；say;wait;glad;train;bag;at;today. PL是什么意思 n.(pl) pl是什么意思 pl 是什么意思 pl是什么意思 PL是什么意思 pl是什么意思 什么是1PL、2PL、3PL、4PL? john is playing with his toy train happily感叹句是how happy 还是how happily