TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: The cooling agent comprises 50-60 vol.% ethanol, 10-20 wt.% wild Chrysanthemum flower extract, 10-20 wt.% honeysuckle extract, 10-20 wt.% peppermint, 10-20 wt.% lotus leaf extract, 0.1-10 wt.% borneol. Preferred Method: The preparation of wild Chrysanthemum flower extract, comprises: (a) taking wild Chrysanthemum flower with deionized water in a mass ratio of 1:15-20, decocting for 2-3 times (each time for 1-2 hours), combining the decoctions, concentrating at 70 degrees C to obtain a paste with a relative density of 1.10-1.20, (b) adding clear water (10-15 times), adjusting pH value to 6.5-7 using sodium hydroxide solution, allowing to stand for 12-24 hours, collecting supernatant, adjusting pH value to 2-3 using hydrochloric acid solution, allowing to stand for 12-24 hours, collecting the upper liquid, passing through a column, eluting using 60-80% ethanol solution, collecting eluate, vacuum distilling, recovering ethanol, concentrating, vacuum drying to obtain the wild Chrysanthemum flower extract. The honeysuckle extract is prepared by: (i) extracting honeysuckle using 60-90% ethanol solution (5-10 times) under the pressure of 100-200 MPa for 15-20 minute, filtering, refrigerating, centrifugally separating, and collecting supernatant, (ii) passing through a column, eluting using 20-50% ethanol solution, collecting eluate, recovering ethanol, freezing and drying to obtain the honeysuckle extract. The preparation of the lotus leaf extract, comprises crushing lotus leaf, leaching in a mixed solution of acetone and water for 2-5 days, filtering, vacuum recovery of acetone to obtain lotus leaf aqueous extract, extracting using ethyl acetate or normal butanol, recovering solvent, concentrating the extracted liquid, freezing and drying to obtain the lotus leaf extract.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The cover on the ball set further comprises a cap. The lower part of the inner wall of the cap is provided with a projection, which is sleeved with an annular groove at the outer periphery at the lower part of the bottle mouth.