最好听的是下课的铃声最难听的是上课的铃声
[zuì hăo tīng de shì xià kè de líng shēng zuì nán tīng de shì shàng kè de líng shēng]
Expresses the preference for school's end bell over the class-starting bell, likely evoking feelings of liberation at day's end as opposed to when work must commence.