So, something at 30 decibels would be pretty faint.Maybe somebody whispering to you in a library.You are probably listening to me at a level of around 60 decibels right now, unless you're sitting right next to the speaker.Exposure to anything above 85 decibels for too long can cause hearing loss.So, why would someone want to invent something louder than 154 decibels?A vacuum cleaner, a freight train.80s heavy metal gods, Manowar.None of this can stand up to this monstrous system: it's so loud it will literally kill you.Or at least completely rupture your eardrums.It's called the Large European Acoustic Facility.LEAF, for sure.It's operated by the European Space Agency in the Netherlands.They use it to simulate the rigors of spaceflight.Things like the noise from a rocket launch.Or the intense friction experience for passing in and out of the atmosphere.The giant room that makes up the speaker, has massive horns that can blast air so powerfully, that sounds inside the room can exceed 154 decibels.That's like standing in the center of a group of jets if they take off all around me.And so, the scientists don't melt their brains.The room is surrounded by steel-reinforced concrete and rubber padding.Plus, the horns won't operate unless all the doors are locked and sealed.Welcome to the Roll Call.It's worldwide Wednesday.That means, we are going global to see who is watching CNN STUDENT NEWS.In Manila, Philippines, hello to the students of Santa Thomas University.
因此,30分贝的声音相当微弱。也许可能就像有人在图书馆跟你低语。你现在听我讲话可能是60分贝左右的水平,除非你是在麦克风旁边坐着。暴露在高于85分贝环境下太久会导致听力丧失。那为什么有人还想发明比154分贝还高的东西呢?吸尘器,货运列车都是这样。还有80年代的重金属战神。而没人可以承受如此系统带来的噪音:单单响亮的声音会杀了你。或者至少完全使你的耳鼓破裂。它被称为欧洲大型音响设备。简称LEAF。它是由荷兰的欧洲航天局实施。他们使用这套设备来模拟航天的严酷。比如火箭发射的噪声。还有进出大气层强烈的摩擦体验。巨大的房间,扩音器,巨大的喇叭使得声音如此巨大,听起来在房间内可以超过154分贝。这就像站在一群飞机的中央，它们马上在我周围起飞的感觉。然而科学家们的聪明才智并没有将他们的大脑熔化。房间周围有钢筋混凝土和橡胶垫。另外,除非所有的门已经上锁着并且密封，喇叭才会响起。欢迎来到点名节目环节。这是全世界的星期三。这意味着,我们要前往世界,看谁正在收看CNN学生新闻。在菲律宾的马尼拉,圣托马斯大学的学生们，你们好。
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