在尤卡坦半岛东海岸外科苏梅尔岛上，一只色彩斑斓的鬣蜥被近距离捕捉到。
A colorful iguana is captured up close on Cozumel Island off the eastern coast of the Yucatán Peninsula.
捕捉过程是这样的，因为低频波可以传输到更远的距离，当它们遇到地下的空穴或其他物体反射回来的时候，已经距地面的接收装置很远了。
The catch is that because low-frequency waves can travel great distances, when they do bounce off cavities or objects underground, they often end up far from the detection equipment at the surface.
你所需要的焦距取决于你和被拍摄焰火间的距离，以及你想捕捉到怎样的画面。
The focal length you need depends on your distance from the burst and what you're trying to capture.
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