升级换代的英文：
(domestic industries gradually) upgrade and renew themselves

domestic是什么意思：
adj. 家庭的；热心家务的；国内的；驯养的
n. 仆人，佣人

A servant, especially a domestic servant.
佣人仆人，尤指家仆

The pig is a domestic animal.
猪是一种家畜。

It was a scene of such domestic bliss.
这是一派天伦之乐的场景。

industries是什么意思：
n. 企业，行业；【总称】工业；勤勉，勤奋；

primary industry,secondary industry,tertiary industry
第一产业、第二产业、第三产业

learned industriousness
习得勤奋性

Industrial research is the province of the Department of Trade and Industry.
工业研究属贸易和工业部的职责范围。

gradually是什么意思：
adv. 逐步地，渐渐地，渐进的

But that climb will be gradual.
但是，这个攀升将是平缓的。

The muddy river cleared gradually.
污浊的河流渐渐变清了。

To gain entrance gradually or surreptitiously.
渗透逐渐地或秘密地获得进入权