现在存有一大未知数，即到达导致气候进一步变暖的危险临界点时的情形——比如储存在北极甲烷水合物被释放出来。
One big unknown is the stage at which dangerous tipping points would be reached that lead to further warming - for example the release of methane hydrate deposits in the Arctic.
他还存有一线希望，他刚才牵着珂赛特在月光下穿过这一大片空地的时候，那几个人也许还没有上桥，也就不至于看见他。
One hope remained to him; it was, that the men had not, perhaps, stepped on the bridge, and had not caught sight of him while he was crossing the large illuminated space, holding Cosette by the hand.
新法延迟出台的一大原因便是，新法对于这些企业是否适用始终存有争辩。
One of the causes of the new law’s delay was the debate over whether these firms, which comprise a huge chunk of China’s economy, should be covered by it.
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