听说泪水是苦的听说海水是咸的
[tīng shuō lèi shuĭ shì kŭ de tīng shuō hăi shuĭ shì xián de]
'Rumor has it that tears are bitter, rumor has it that seawater is salty.' This refers to experiences of hardship—bitter tears represent sadness or suffering; salty sea water stands for endless troubles or overwhelming challenges.