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人们常用“炉火纯青”来形容一个人很高的技术或专长水平。“炉火纯青”是什么意思呢? 古人一般用木材或煤炭做燃料,这些燃料的火焰一般都是红色的。因为这些燃料都含有碳、氢等元
People often use “green tea” to describe a person’s high level of skills or expertise. What does it mean to be “green”? The ancients used wood or coal as fuel. The flames of these fuels were generally red. Because these fuels contain carbon, hydrogen, etc.