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只有学生能听到的手机铃声

2006-07-02 12:52

  Students are using a new ring tone(铃音)to receive messages in class —— and many teachers can't even hear the ring.

  Some students are downloading a ring tone off the Internet that is too high-pitched to be heard by most adults. With it, high schoolers(高校学生)can receive text message alerts on their cell phones without the teacher knowing.

  As people age, many develop what's known as aging ear(耳朵老化)—— a loss of the ability to hear higher-frequency sounds.

  The ring tone is a spin-off(副产品)of technology that was originally meant to repel(击退)teenagers —— not help them. A Welsh security company developed the tone to help shopkeepers disperse(分散)young people loitering(闲荡)in front of their stores while leaving adults unaffected. The company called their product the "Mosquito(蚊子)."

  Donna Lewis, a teacher in Manhattan, says her colleague played the ring for a classroom of first-graders —— and all of them could hear it, while the adults couldn't hear anything.

  Note:

  纽约高校学生从网络上下载到一种只有他们自己能听到、而老师听不到的手机铃声。这种铃声的频率非常高,一般成年人的耳朵不能听到。这种技术本来是用于驱逐在商店门口闲逛的小孩儿,结果反被用来扰乱课堂了。

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