知乎,中文互联网高质量的问答社区和创作者聚集的原创内容平台,于 2011 年 1 月正式上线,以「让人们更好的分享知识、经验和见解,找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容,聚集了中文互联网科技、
Echinoderm Evolution Ancient Mapmaking 8 The Effects of Squirrels' Storing Behavior The Difference Threshold and Signal-detection Theory Was There Water on Ancient Mars? 9 Sensing Airflow The Columbian Exchange (加试) The British Economy in the Eighteenth Century Origins of Earth's Salty Oceans 10 ...
was only designed to last for three months, but Spirit has worked for more than five years doing additional missions. Both rovers have made important discoveries about ancient Mars. They have taken thousands of images and found evidence in the rocks of a water, warmer past in Mars’ history....