丁基

例句：

1. 1. The gasoline is made from the octane number of the base stock and the addition of a small amount of butane.
   汽油是由基础油的辛烷值和少量丁烷添加而成。
2. 2. The octane rating is an important factor in determining the performance of gasoline.
   辛烷值是决定汽油性能的一个重要因素。
3. 3. The addition of butane can improve the octane rating of gasoline.
   添加丁烷可以提高汽油的辛烷值。