Carbon dioxide remains in the atmosphere for centuries, and even the most optimistic proposals for CO2 sequestration would take decades to have an effect.
二氧化碳在大气中可以存留数个世纪，即使是最乐观的提议封存CO2也会持续影响数十年之久。
They are cautiously optimistic because of the constructive atmosphere in which the talks will take place.
他们保持谨慎的乐观，因为会谈将在积极的气氛中举行。
In addition, the inventory situation is not optimistic. Because of the market, watching atmosphere last varieties of social common stock steel.
此外，库存形势也不容乐观。由于市场观望气氛渐浓，上周各品种钢材社会库存普遍出现上涨。
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