Striae   Striae refers to the natural lines of the skin and muscles, and the spaces between the skin and muscles. It serves as an entrance and outlet for the flow of qi (vital energy) and blood, and as one of the routes for body fluid excretion. They also serve as a barrier against exogenous evils.		cou li 腠理   腠理指皮膚、肌肉的紋理，以及皮膚與肌肉之間的間隙。中醫認為這些是氣血流通的門戶，排泄體液的途徑之一，亦是防御外邪入侵的屏障。