1958年，澳大利亚科学家戴维·沃伦开发了一种飞行记录仪，可以追踪飞行高度和飞行方向等基本信息。
In 1958, Australian scientist David Warren developed a flight-memory recorder that would track basic information like altitude and direction.
这种小猎犬的嗅觉高度发达，能够追踪气味，因此很适合这项工作。
A beagle is good for the work because of its powerful nose, and ability to follow smells.
通过把全世界海浪高度和嗡嗡声的强度相比较，科学家能追踪到这种声音的来源。
By comparing the intensity of the hum with the height of waves around the world, scientists can track where the buzz is coming from.
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