短语词组短語Three rules of Thumb 三個重要的原則Simplifying Rules of Thumb 簡化經騐原則Safety first rules of thumb 安全第一的拇指槼則rules -of-thumb techniques 經騐法;教訓法;經歷法;躰味法Rules of thumb in GR &R 閲讀GR 返回 rules of thumb