As defined in the PRC, characters were simplified according to nine principles: 1. Retaining an outline of the original shape, e.g., 龟for 龜 (gui, "tortoise; turtle") and 虑for 慮 (lu, "consider").
簡體邏輯依中共說法，漢字簡化有 9 大原則：一、保留原字輪廓：如龜（龟）、慮（虑）。