一人一半才是伴一人一口才是侣
[yī rén yī bàn cái shì bàn yī rén yī kŏu cái shì lǚ]
This suggests that a true companion or partner is someone who equally shares everything, from one's life to even sustenance. It symbolizes mutual support and companionship in relationships, signifying equality and partnership in every aspect of life together.