Tā zài liǎng rén de xiāngshí zhōng bànyǎnle yǐnxiàn de juésè.
She played the role of go-between in introducing the two of them.
Tips
usage
引线 has both a literal meaning (fuse, electrical lead) and a figurative one (intermediary or catalyst for bringing things or people together). The idiom 引线穿针 (threading a needle) means to act as a matchmaker or go-between.
