为什么dining room 不双写n

为什么dining room 不双写n dining-room和dining room哪一个正确 DINING ROOM怎么样 dining room怎么读 dining-room的意思 DINING ROOM怎么样 dining room怎么读 dining room的意思? dining room怎样造句 英语-为什么dining 和beginner一个双写n一个不双写n? dining room的英文是什么 dining room是什么意思?谢谢啦! long dining room的意思 dining room怎么造句快点 my dining room的作文 是dinning room还是dining room? Our school dining room is very large我可以把这句话写成Our school's dining room is very large吗?为什么? a policeman came into the dining-room .