diàn / tái / měi / tiān / zhōng / wǔ / zhǔn / shí / shòu / shí / fāng / biàn / dà / jiā / jiào / zhǔn / shǒu / biǎo

电台每天中午准时授时，方便大家校准手表。

The radio station broadcasts a time signal at noon every day so that people can set their watches accurately.