除了四大发明还有很多千年之前的发明,至今在生活中仍...[
http://ww4.sinaimg.cn/large/a15b4afely1fh7tjhearaj20c80man21http://ww4.sinaimg.cn/large/a15b4afely1fh7tjiisraj20c80lvdk3
http://ww4.sinaimg.cn/large/a15b4afegy1fh7tjjn445j20c80l1whu
http://ww4.sinaimg.cn/large/a15b4afegy1fh7tjk9t7zj20c80m8763
http://ww4.sinaimg.cn/large/a15b4afegy1fh7tjksjygj20c80kwabk
http://ww4.sinaimg.cn/large/a15b4afely1fh7tjm0txsj20c80l5425
http://ww4.sinaimg.cn/large/a15b4afely1fh7tjmo716j20c80lbmyq
http://ww4.sinaimg.cn/large/a15b4afely1fh7tjnp801j20c80lrjvj
http://ww4.sinaimg.cn/large/a15b4afegy1fh7tjpa304j20c80lddhb
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