美国科学60秒 SSS 2015-05-01
时间：2019-01-20 作者：英语课 分类：2015年Scientific American(五)月
英语课
This is scientific American ,60 second science. I’m Chris D..ta. Got a minute?
In less you have a pair of noise-cancel headphones. Flying can be annoying to the ears. A lot of low-pitch rumbling 1 makes it into the cabin. The problem is ,the wings ,floors, ceilings ,and bolcats, are lined with the lightly material with a honey cone 2 structure, which adds to the structural 3 integrity to the aircraft. But engine and airflow sound cuts right through. “The physical law says that the lighter 4 the material is the worse it could block the sound.” UN? Jane is an acoustician in north Caroline University. In a quest for quiet, he and his colleagues constructed a similar material. But with a quarter mille-meter of thin latex, stretch across the cells of the honey cone. In test, the latext layer structure cut the intensity 5 of low frequency rumbling to a thousand of its previous level. “enough” He says, ”to make an airplane cabin sound more like a peaceful living room. The study in the journal applied 6 physics letters. Problem is the material Gin develops is six percent heavier than the standard stuff. And more weight means more fuel, means more expense. But if we settle for a little slightly quieter flight, Gin says could use less lay text. Making the noise barking honey cone just a few percent heavier. Considering the honey cones 7 are one of the lightest part of the airplane, you then looking at a modest plane weight gain. Of course, Let’s assume everyone wants a quieter plane. “Some people say that they actually want to hear the sound of engine. They don’t want that the cabin is too quiet. They want to make sure that the plane is flying. ” Sounds like ? expensive headphones a little while ?
n.圆锥体，圆锥形东西，球果
- Saw-dust piled up in a great cone.锯屑堆积如山。
- The police have sectioned off part of the road with traffic cone.警察用锥形路标把部分路面分隔开来。
adj.构造的，组织的，建筑（用）的
- The storm caused no structural damage.风暴没有造成建筑结构方面的破坏。
- The North American continent is made up of three great structural entities.北美大陆是由三个构造单元组成的。
n.打火机，点火器；驳船；v.用驳船运送；light的比较级
- The portrait was touched up so as to make it lighter.这张画经过润色，色调明朗了一些。
- The lighter works off the car battery.引燃器利用汽车蓄电池打火。
n.强烈，剧烈；强度；烈度
- I didn't realize the intensity of people's feelings on this issue.我没有意识到这一问题能引起群情激奋。
- The strike is growing in intensity.罢工日益加剧。
adj.应用的；v.应用，适用
- She plans to take a course in applied linguistics.她打算学习应用语言学课程。
- This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。