他说：“毫无疑问，要逐渐停用煤炭，这种污染最严重的化石燃料，对中国来说是一个巨大的挑战，对其他国家也是如此。”
There is no question that phasing out coal, the most polluting of fossil fuels, will be a challenge for China, as it is for all countries.
12月23日发表在《自然》科技期刊上的最新分析排除了所有疑问——而且为该新人种原本贫乏的证据增添了一颗现代科学能够检验的牙齿化石。
The latest analysis, published in Nature on December 23rd, removes any doubt-and adds a tooth to the meagre stock of evidence from the new species that modern science is able to examine.
新疆阿图什的温古尔—巴音库鲁提一带二叠系由于化石稀少而且保存不好，地层确切时代仍存在疑问。
Because fossils are rare and poorly preserved, the exact age of the Permian in the Wenguer area, Artux County, Xinjiang, is still doubtful.
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