valyl

例句：

1. 1.The valyl is a rare and valuable substance.
   缬尔是一种稀有且有价值的物质。
2. 2.The valyl was discovered in the 19th century.
   缬尔在19世纪被发现。
3. 3. The valyl is used in the production of plastics.
   缬尔用于生产塑料。