Beyond the Antarctic treaties, huge obstacles persist to tapping these resources, like drifting icebergs that could jeopardise offshore platforms.
2016年12月六级真题（第三套）阅读 Section B
Some scientists are examining the potential for harvesting icebergs form Antarctica, which is estimated to have the biggest reserves of fresh water on the planet.
2016年12月六级真题（第三套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
N-COUNT
冰山 the tip of the iceberg
An iceberg is a large tall mass of ice floating in the sea.