zhè / jiā / diàn / xìn / gōng / sī / zhèng / zài / shēng / jí / chéng / kòng / jiāo / huàn / jī / yǐ / tí / gāo / tōng / huà / zhì / liàng

这家电信公司正在升级程控交换机，以提高通话质量。

This telecommunications company is upgrading its stored-program control exchange to improve call quality.