medium heavy fuel

例句：

1. 1.The new engine uses medium heavy fuel to power its operation.
   这款新发动机使用中等重量的燃料来驱动其运行。
2. 2.The tank was filled with medium heavy fuel for the long trip ahead.
   为了长途旅行，油箱被装满了中等重量的燃料。
3. 3.The heavy machinery used medium heavy fuel, which is a mix of oil and gas.
   重型机械使用了混合油和气体的中等重量燃料。