Lesson 47: Mysterious Experiences 四個highlight均是長音i，似乎舌頭沒太壓到位。
691. My aunt said she once saw a ghost.
692. What was that noise?
693. I think there’s something in the darkness.
694. No one knew what happened to Simon. 美音最好發成長音u，類似nu：的音，而不是類似niu的音。我沒聽原讀，不知原讀是什麽。
695. The killer’s identity remained unknown.
696. The police don’t know who took the jewels.應該是長音u，你的似乎是短音u
697. Her recipe is good because of the secret ingredient.
698. His job in the war is still a secret.是不是發成類似稍微偏/啊/的音更美味？
699. She says that she can predict someone’s future.
700. Some people believe that aliens visit Earth from other planets.
701. Truthfully, there have been some unexplained occurrences around the house.
702. Mysterious noises like you heard that seem to have no natural causes.
703. Doors that seem to close on their own and objects that get moved around but not by human hands. t可以hold住，保留舌頭位置。
704. A couple of months ago, a friend and I went to a psychic just for a few kicks.
705. Not everything that happens in the world can be explained.
