() used to describe a system, product, etc. that is no longer generally available, but that is still used（系统、产品等）遗留下来的，旧有的◆legacy software such as Windows 98诸如 Windows 98 这样的旧有软件◆The cost of replacing a legacy computer system can be huge.替换旧有电脑系统的费用可能很庞大。used to describe something that took place in the past but still affects the present传统的◆The company's difficulties are the result of poor legacy decisions.这家公司的困难是由糟糕的传统决策造成的。