cyestein

例句：

1. 1. The importance of selenium in human health cannot be overstated.
   硒在人类健康中的重要性不可忽视。
2. 2. Selenium is a trace element that plays a crucial role in the body's antioxidant defenses.
   硒是一种微量元素，对体内的抗氧化防御起着至关重要的作用。
3. 3. In recent years, researchers have discovered new ways to synthesize selenium compounds for medical applications.
   近年来，研究人员已经发现了新的合成硒化合物的方法，用于医疗应用。