zhè tái / jī qì / chāi kāi / hòu / gōng rén / fā xiàn / nèi bù / jī gòu / yán zhòng / bì xū / xiān / chè dǐ / qīng lǐ

这台机器拆开后，工人发现内部积垢严重，必须先彻底清理。

After taking the machine apart, the workers found heavy buildup inside and had to clean it thoroughly first.