Progress on the climate change bill is seen as essential a to a successful outcome at the international meeting on carbon reduction in Copenhagen in December.
气候变化法案的进展被视作促进12月哥本哈根减少碳排放的国际会议取得成功的必不可少的条件。
I had been in Los Angeles just long enough to understand how essential a car is.
我们刚搬到洛杉矶没有多久，明白一辆汽车是多么必要。
Uniqueness: Although not essential, a site usually offers something unique either in terms of coverage or format compared to a similar print resource.
独特性：虽然并非必不可少，但与类似的纸质印刷材料相比，无论是覆盖范围还是编排格式方面，网站在提供信息时应具有一定的独特性。
Uniqueness: Although not essential, a site usually offers something unique either in terms of coverage or format compared to a similar print resource.
独特性：虽然并非必不可少，但与类似的纸质印刷材料相比，无论是覆盖范围还是编排格式方面，网站在提供信息时应具有一定的独特性。
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