三年之痒七年之约
[sān nián zhī yăng qī nián zhī yuē]
'San Nian Zhi Yang Qi Nian Zhi Yue' is a creative phrase referring to two different Chinese sayings combined together. 'Three year's itch' means the time couples tend to start feeling less passionate about each other. 'Seven years' agreement' is often seen in fairy tales indicating a period of contract which may suggest this phrase is related to commitment and relationship longevity.