十指相扣天长地久五指连心地久天长
[shí zhĭ xiāng kòu tiān zhăng dì jiŭ wŭ zhĭ lián xīn dì jiŭ tiān zhăng]
The intertwining fingers symbolize love, trust, and eternal relationship vows that last forever. Both expressions refer to enduring feelings or bonds, wishing for perpetual harmony between two people.