Objectives: to examinate stability of melatonin and its improving sleep function and its safety as a healthy food.
目的：检验保健品中褪黑素含量的稳定性及其改善睡眠功能和毒理学安全性。
At the start of a match and whenever he changes his racket during a match a player shall show his opponent and the umpire the racket he is about to use and shall allow them to examinate it.
比赛开始时及比赛过程中运动员需要更换球拍时，必须向对方和裁判员展示他将要使用的球拍，并允许他们检查。
At the start of a match and whenever he changes his racket during a match a player shall show his opponent and the umpire the racket he is about to use and shall allow them to examinate it.
比赛开始时及比赛过程中运动员需要更换球拍时，必须向对方和裁判员展示他将要使用的球拍，并允许他们检查。
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