在中国传统文化中，往生者要含一粒珍珠是因为珍珠在民间信仰中被认为是可以保护人的物品。珍珠具有美丽光泽，象征着纯洁和完美，因此被赋予神秘和神圣的象征意义。同时，人们相信珍珠可以净化身体和灵魂，抵御不良的气场或张扬的情绪，从而达到保护和平静的作用。
在往生者含珍珠的传统中，含珍珠的往生者被认为被大自然所保护，并且可以帮助魂灵安详地离开人世，顺利地步入来世。因此，在一些地区，家属会在丧仪上将珍珠放在往生者的口中，以代表着珍珠的温柔力量和无尽祝福。这个传统虽然在现代社会中已经逐渐被改变，但仍然在一些地区有保留和遵循。
In traditional Chinese culture, the reason why the deceased should have a pearl in their mouth is because in folk beliefs, pearls are considered to be items that can protect people. Pearls have a beautiful luster and symbolize purity and perfection, so they are endowed with a mystical and sacred symbolic meaning. At the same time, people believe that pearls can purify the body and soul, resist negative energy or exuberant emotions, and achieve a protective and peaceful effect.
In the tradition of the deceased having a pearl in their mouth, the deceased with the pearl are considered to be protected by nature and can help the soul peacefully leave this world and smoothly enter the next. Therefore, in some areas, family members will place pearls in the mouth of the deceased during the funeral to represent the gentle power and endless blessings of pearls. Although this tradition has gradually changed in modern society, it is still preserved and followed in some areas.
