like birds that pair off wing to wing or trees that have their branches intertwined—deep affection of a devoted couple
比翼连枝bi yi lian zhi
like birds that pair off wing to wing or trees that have their branches interwind(meaning deep affection of a devoted couple)
比翼连枝bǐ yì lián zhī
比翼：一种鸟名。比喻夫妇亲密不离。fly side by side or trees with their branches interwined