多年来科学家都对海水酸化对甲壳类生物的未来的影响非常担忧，不过根据一项新的研究表明，这情况已经发生了，而且已经持续了上百年。
Scientists have worried for years about ocean acidification affecting shelled creatures in the future, but according to a new study, it's already happening, and has been for over a hundred years.
商业原因：这通常发生在智能资本已经以论文，演讲，技术文档，等等形式存在，但是正式的培训不存在的情况下。
Business reason: This is usually done when intellectual capital already exists in the form of whitepapers, presentations, technical documents, and so on, but no formal training exists.
但当冰层开始融化时——就像近年来已经发生的情况一样，这主要归咎于气候变暖——北极熊可能会忍饥挨饿，逐渐死亡。
But when the ice begins to melt - as it has in recent years, thanks largely to warming - the bears can starve and die.
应用推荐