图片浏览者能够添加评论，关键词，在三个图集——“发射”、“NASA建设”与“用历史人物命名的NASA宇航中心”上圈人。
Viewers can add comments, keywords and identify people in images in the three sets - Launch/Takeoff, Building NASA, and NASA Center Namesakes, which records historical figures.
历史人物评价是乾嘉时代史家赵翼历史评论的重要内容。
An important aspect of Zhao Yi's historical work is criticism of historical figures.
历史人物评价是乾嘉时代史家赵翼历史评论的重要内容。
An important aspect of Zhao Yi's historical work is criticism of historical figures.
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