Definition
这是一条四字固定短语，字面意思是“更换旧的，换成新的一代”。通常用于指产品、技术、设备或制度的升级换代，强调用更先进、新型的替代过时的。常作谓语，也可作宾语或定语。
f.e.
to upgradeto replace the old with something new (generation)
Examples
- 更新换代。Zhè jiā gōngsī měinián dōu huì duì chǎnpǐn jìnxíng gēng xīn huàn dài.This company upgrades its products every year.
- ，更新换代。Suízhe kējì de fāzhǎn, diànnǎo gēng xīn huàn dài de sùdù yuè lái yuè kuài.With the development of technology, the speed of computer upgrades is getting faster and faster.
- 更新换代，。Chéngshì de jīchǔ shèshī xūyào bùduàn gēng xīn huàn dài, cáinéng mǎnzú rénmen de xūqiú.Urban infrastructure needs constant upgrading to meet people's needs.
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