qǐng / xiān / bǎ / zhòng yào / wén jiàn / bèi fèn / dào / yún duān / zài / gēng huàn / diàn nǎo de / yìng dié

请先把重要文件备份到云端，再更换电脑的硬碟。

Please back up the important files to the cloud before replacing the computer's hard drive.