珍视 (zhēn shì) means 'to treasure, to cherish, to value highly' — it emphasizes regarding something as precious and treating it with care, often used for abstract things like opportunities, friendships, or memories. It is similar to 珍惜 (zhēn xī) but slightly more formal and with a stronger sense of 'valuing highly'; 珍重 (zhēn zhòng) is more about taking good care of oneself or a relationship, especially when parting.