Sac-winged bats perform elaborate courtship displays with acoustic visual and olfactory elements .
囊翼蝠(sac-wingedbat)表演的精心求偶包含了听觉、视觉和嗅觉元素。
It achieves its ultra-quietness by virtue of 3.3-foot-thick fiberglass acoustic wedges , double walls of insulated steel and foot-thick concrete .
凭借3.3英尺厚的玻璃纤维听觉楔子,绝缘钢和英尺厚的混凝土形成的双层墙壁,它实现了超静音。
These so-called baryon acoustic oscillations offer another yardstick for measuring the expansion rate of the universe over time and putting limits on the value of dark energy .
这些被称为重子声学振荡的东西为测量随时间变化的宇宙的膨胀速度和对暗能量的值施加限制提供另一尺码。
Military researchers are looking to combine an acoustic gunshot detector with a dazzling laser that will startle shooters who take aim at american helos .
Archeologists speculate that the weak foundations may have had some acoustic purpose : perhaps the pillars were meant to hum in the wind .
考古学家们推测,地基简陋的原因可能是为获得声学上的作用:也许这些石柱本是为了在风中发出声响。
This sort of acoustic analysis might sound like the exclusive province of spies and spooks , but according to dr tygar , such attacks are not as esoteric as you might expect .
In most cases , both sets of modifications can be tested in mock-up form using cardboard ( and wide tape ) to extend the guarding and temporarily fitting areas of acoustic foam inside .
Woody norris is a serial inventor of electronics , tools and cutting-edge sonic equipment -- such as the lrad acoustic cannon .
woodynorris:发明家,主要发明电子器件、工具和前沿声学设备例如lrad声波炮。
Ms novak took a variety of medieval weapons from the collection of the royal armouries and poked them through pieces of acoustic ceiling tile to see what shape they made .
诺瓦克从皇家军械库的藏品中取来不少中世纪兵器作戳刺声学天花板实验,研究它们留下的切口。
And both american and israeli armies and some less scrupulous police forces around the world are said to have used a sonic tool , the " long range acoustic device " .