tea stem

例句：

1. 1. The tea leaves are steeped in water for several hours before being used.
   茶叶在水里浸泡几个小时后才能使用。
2. 2. The tea stem is a traditional Chinese medicine that has been used for centuries.
   茶梗是一种传统的中药，已经被使用了数百年。
3. 3. The tea stem is also known as the "dragon's blood" because of its red color and unique flavor.
   茶梗也被称为“龙血”，因为它的红色和独特的味道。