Huge waves wash sand endlessly: We often say that big waves wash sand, but no matter how you wash it, there will still be sand in the water;
A change of heart: A change of heart means that time passes quickly, but no matter how time changes, the sea turns into a mulberry field, but the affection remains the same, which, in common parlance, means that the sea dries up and the rocks rot.
hehe, this is your girlfriend's declaration of love for you:)