这爱说不清也道不明这心填不满也掏不空
[zhè ài shuō bù qīng yĕ dào bù míng zhè xīn tián bù măn yĕ tāo bù kōng]
A line referring to unexplained love or feelings that can't be expressed or defined in simple terms; indicating profound emotions and the speaker seems entangled, struggling and can hardly extricate themselves out. Such complicated sentiments always haunt them and make hearts feel confused yet full, unsatisfied yet inexhaustible.