通过考察这个时期坟墓中发现的刀、钻、斧、锄等工具，可以发现冶炼技术已相当发达。

According to the researches on the tools including knives, driller, axes, hoes, etc. where were unearthed in the tombs of that age, it can be found that the smelting technology was very advanced then.

youdao

刀，耜往往与锄，铲并用，配套，说明当时已经有了精耕细作的生产程序，标志着当时农业生产已达到相当高的水平。

Knives, si often hoe, shovel and use, supporting, at the time that has been intensive production processes, agricultural production marked the time has reached a very high level.

youdao