1. pinyin: yào shi. key is a common lock-opening tool in people's life, and the materials used to make keys are mainly copper, zinc, aluminum, iron and other metals. The invention of the key is later than the lock, 4000 years ago has appeared in ancient Egypt. There are many types of keys, there are ordinary keys, smart keys, remote control keys, electronic keys and so on.

2. Source: "Historical Records - Lu Zhonglian Zouyang Liezhuan" " Lu people cast its LIVIV" Tang Zhang Shoujie justice: "LIV, the key."