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.

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。

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Travel agencies said they will launch more lines to disappearing resorts including the Maldives and the Great Barrier Reef off Cairns in Australia.

旅行社方面表示，将针对或将消失的旅游热点，逐步推出以马尔代夫、澳大利亚凯恩斯大堡礁等景点为代表的"世界绝景游"系列线路。

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They had crossed the river full of crocodiles, he climbed to China's Great Wall, take photographs in the Statue of Liberty, the ultimate owner of the Academy, and last week the completion of travel.

他们曾穿过满是鳄鱼的河流，曾登上过中国的万里长城，曾在自由女神像下拍照，终极奥斯卡和主人于上周完成了旅行。

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Since the particulates travel great distances before they are washed out, even this small dose is not a function of distance from the power plant, but is randomized geographically.

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For many, the speed with which they can move through this stage of travel is a great benefit.

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So as the glittery NBA season looms, they're slogging it out in China where salaries aren't great, travel can be arduous, the accommodations aren't always luxurious and the food is a constant adventure.

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