1. On the other hand, the transparent linking of wired and wireless networks is an unsolved problem. 另一方面，有线和无线网络间的透明连接是一个尚未解决的问题。
2. It is one of the great unsolved mysteries of this century. 这是本世纪尚未解开的大奥秘之一。
3. Will the Internet help explain these unsolved mysteries? 互联网能帮助解释这些未解之谜吗？
4. Canada, and Europe have received a great deal of media and even research attention over unusual phenomena and unsolved mysteries. 加拿大和欧洲因为一些不寻常的现象和未解的谜团而受到了大量媒体甚至研究的关注。
5. Over the past several decades, the U.S., Canada, and Europe have received a great deal of media and even research attention over unusual phenomena and unsolved mysteries. 在过去的几十年里，美国、加拿大和欧洲收到大量关于不寻常现象和未解之谜的媒体关注，甚至还有研究者的关注。
