Example
jiǎn简dān单lái来shuō说，jiù shì就是yīn因wèi为wǒ我fù附zài在shàng上yì一fēng封diàn电yóu邮de的「planplan.docdoc」dàng档àn案bèi被diàn电nǎo脑bìng dú gǎn rǎn病毒感染le了。
简单来说，就是因为我附在上一封电邮的「plan.doc」档案被电脑病毒感染了。
In short, it is because the 'plan.doc' file I attached in the previous email was infected with a virus.