vetivene

例句：

1. 1. The vetivene is a rare and valuable material.
   这种物质是稀有且有价值的。
2. 2. The vetivene has been used in traditional medicine for centuries.
   这种物质在传统医学中被使用了几个世纪。
3. 3. The vetivene is extracted from the bark of the tree, which is native to South America.
   这种物质是从南美的树皮中提取出来的，这种树是原生的。