Many kings and emperors used silver chopsticks to see if their food was poisoned.
许多帝王用银制的筷子以检查他们的食物中是否被人投了毒。
This is a kind of printing that blind people can read by touching groups of raised points that are printed on paper.
布莱叶盲文是一种印刷字体,盲人通过摸印在纸上起的点点来读书。