Diàngōng jiǎnchá le wū nèi de huǒxiàn shìfǒu ānquán.
The electrician checked whether the live wires inside the house were safe.
Tips
usage
火线 has two main meanings: military (front line / firing line) and electrical (live wire). In metaphorical usage, 火线提拔 means to be promoted in the thick of action.
