科学家仔细察看行星照片，寻找生命迹象。
Scientists are studying photographs of the planet for signs of life.
在过去的10年里，科学家们已经开始通过卫星观测察看这种趋势，早期的研究表明在全球范围内浮游植物生产力发生了小幅下降的情况。
Over the past decade, scientists have begun looking for this trend in satellite observations, and early studies suggest there has been a small decrease in global phytoplankton productivity.
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