但当热衰竭时体温调节系统虽仍具功能因到达皮肤的血流不够充足以致不能有效且快速地散热所致
However, when heat exhaustion occurs, although the thermoregulatory system still functions, it is due to insufficient blood flow to the skin, which makes it unable to dissipate heat effectively and quickly
以上为机器翻译结果，长、整句建议使用 人工翻译 。