它们总是脱离主冰帽，在洋流的推动下四处漂浮，直到最终融化并被晒干。
They are always breaking away from the main caps and floating around, pushed by currents, until they eventually melt and are was ted.
经济学家们正致力于使用更加稀奇的工具来斗法，这些工具从致命蚊子到无嗣的印度土邦主，或是近期的风速、洋流等无所不包。
Economists are outdoing each other with ever more curious instruments, ranging from lethal mosquitoes to heirless maharajahs, or, most recently, wind speeds and sea currents.
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