机械动图第21期：这些科技真厉害，不仅实用还有趣
平时不是特别关注各种科技动态的话，估计下面这些动图你都没见过。那么就来感受一下，人类的生活已经在多大程度上被科技改变了吧：
纳米机器人拿起一个精子，并用它进行授精
蚂蚁的“跑步机”，用处不明
自动刷牛机，虽然不算多么高科技，但很有趣
没看懂是什么，只是感觉很神奇
像手指的几根，可以拧螺丝
工业级自动削西瓜机
无限放置玩具火车轨道的机器
公路桥是怎么造的？全靠这种机器
自动化纸飞机制造机
自动平衡调节台球桌（用在船舶上）
对挠痒有反应的玩偶（已去掉毛皮）
光学分类器，自动去除未成熟的番茄
机器人刀手，这下玩游戏就不怕被误伤了！
再过20年会怎样？难以想象
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