The polonium itself, with its rarity and trail of irradiated locations (see article) ought to be a telling clue.
由于钋本身稀有且所过之处留下的放射可被追踪（另见他文），应该能成为发掘信息的线索。
A combination of epic story telling, visually stunning camerawork, extraordinary locations and passionate presenting combine to form a highly original version of human history.
结合的史诗故事讲述，视觉震撼的摄影工作，非凡的位置和热情合并成一个高表现人类历史的原版本。
A combination of epic story telling, visually stunning camerawork, extraordinary locations and passionate presenting combine to form a highly original version of human history.
结合的史诗故事讲述，视觉震撼的摄影工作，非凡的位置和热情合并成一个高表现人类历史的原版本。
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