yī / tīngdào / língshēng / tā / jiù / fēnmì / tuòyè / zhè / shì / diǎnxíng / de / tiáojiànfǎnshè

一听到铃声，他就分泌唾液，这是典型的条件反射。

As soon as he heard the bell, he secreted saliva—this is a classic conditioned reflex.