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人随着年龄增加会逐渐失去高频声音的听力,医学上称为老年性耳聋(presbycusis)。根据这种原理,威尔士一家安全公司发明了一种“青少年超音驱逐器”(ultrasonic teenager repellent),能够发出脉冲高频,帮助商店主人驱散在店门口闲荡的少年。不想有人又据此制作了高频手机铃声。手机设定为这种铃声后,学生上课时根本不需要将手机调成静音,因为大多数老师听不见。但是对那些年轻的老师,高频率的声音还是可以听得到。这样看来,教师队伍的年轻化很有必要。
As people get older, they gradually lose their high-frequency sound hearing, which is medically known as presbycusis. Based on this principle, a security company in Wales invented an “ultrasonic teenager repellent” that can emit pulsed high frequencies to help store owners disperse teenagers who linger at the storefront. Do not want someone to make a high-frequency mobile ring tones accordingly. After the phone is set to this type of ringtone, students do not need to mute the phone at the time of class because most teachers cannot hear it. But for those young teachers, high-frequency voices can still be heard. It seems that the younger teachers are necessary.