In the past, the scale was 16.2 1 kg, so it was half a catty. "Half a catty" and "evenly matched" both mean "equal regardless of height". However, the emphasis is on the same level of description; "Close" focuses on describing the equal strength, which is mainly used to describe the equal strength of the enemy and ourselves.
Extended data:
The origin of half a catty:
There were three kinds of currencies in circulation in the Eastern Han Dynasty: gold, silver and five baht. Among them, five baht is called money for short, and one thousand baht strung together with rope is called hanging money. In terms of mutual exchange, one hanging of money can be exchanged for one or two pieces of silver, and seventy-two pieces of silver can be exchanged for one or two pieces of gold. At that time, one catty was equal to sixteen taels, that is to say, half a catty was eight taels, which was also one of the origins of half a catty.
Another view is that after Qin unified the six countries, Qin Shihuang ordered a unified survey, and Prime Minister Li Si was responsible for drafting documents. Reese set standards for coins, lengths, etc. But he didn't make up his mind about the weight, so he asked Qin Shihuang for instructions.
Qin Shihuang wrote "Fair on Earth" as an instruction, but did not give the exact number of citations. In order to avoid being accused in the future, Lisi decided to take the number of strokes (total 16 paintings) of the word "Tian Xia Gong" as the weight standard, so he decided that one catty is equal to sixteen taels, and half a catty is naturally eight taels.