America is Australia's closest ally, but China is its second-biggest export customer after Japan; Australia is exploring a free-trade agreement with Beijing.

美国是澳大利亚最紧密的盟友，但是中国是该国仅次于日本的第二大出口对象国；澳大利亚正在同北京研究建立一项自由贸易协定。

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"It was like exploring Australia on foot in the 16th century, " says cancer geneticist Bruce Ponder of the University of Cambridge.

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More than 50 companies exploring geothermal projects in Australia have taken out over 400 licences for areas covering nearly 500, 000 square kilometres a combined area roughly the size of Spain.

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Australia is exploring a free-trade agreement with Beijing.

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