Some of them emit sounds ( usually white noise or a variant ) in an effort to mask distracting noises .
其中一些发出的声音(通常是白噪音或者是变异体)是为了掩盖分心所用的噪音。
Nist scientists use lasers that emit about 1 billion pulses per second .
nist的科学家们用激光器每秒发射约十亿次脉冲。
When these electrons are deflected by molecules in the atmosphere , they emit gamma rays .
当这些电子被大气中的分子所偏转时,它们会发射出伽玛射线。
Torpedoes can still be tricked , in many cases , with decoys that emit sound waves to mimic ships .
对付鱼雷仍然可以使用欺骗手法,多数情况下是发射能够模仿船只声波的诱饵。
Smaller primordial black holes can actually emit more energy than they absorb , which results in them losing net mass .
实际上,小型的原始黑洞发射出的能量多于所吸收到的能量,由此导致净质量的损失。
An ultra-fast laser pulse triggers the atoms to emit photons simultaneously .
一个超快的镭射脉冲引起原子同步放射出光子。
Pointing a laser at the sample causes the first dye to become excited and emit energy .
将激光照射到样本上造成第一个燃料分子被激活继而放射出能量。
One of his greatest achievements in physics is a theory that describes how black holes emit radiation .
他在物理上的最大成就之一,就是描述黑洞如何放射辐射的理论。
The next best option is a wireless bluetooth headset or earpiece , which emit radiation at far lower levels .
另一个很好的选择是使用无线蓝牙耳机或头戴式耳机,因为它们放射出的辐射远低于正常水平。
The unique environment into which this supernova exploded makes it possible for astronomers to observe the condensed dust from the supernova that is usually too cold to emit in the infrared .