捉只蝉以为捉住了整个夏天
[zhuō zhĭ chán yĭ wéi zhuō zhù le zhĕng gè xià tiān]
This phrase means 'Caught a cicada, thinking you caught the whole summer'. By catching a cicada during summertime, one thinks that summer can be captured forever as cicadas symbolize summer. Therefore, the owner may long for good memories or happiness, wanting them to be everlasting and never vanish.