《黄帝内经·素问·宝命全形论》
好像乌鸦集合一样密集，好像稷一样繁茂，气之往来如见乌鸦飞翔，这种得气感觉并不形于外而独有医生能够从针体上感受得到。
见其乌乌，见其稷稷，从见其飞，不知其谁。
Like crows, it is densely packed; like jiji, it is lush; the Qi comes and goes like crows flying. This feeling of obtaining Qi is not visible from the outside, and only the doctor can feel it from the needle.