There are two grades of pellet fuel currently available on the market: standard and premium grades.
在市场上有目前可提供的小球燃料有二个等级：标准和高级。
An essential difference between "premium" and "regular" grades of kerosine is that the former has a higher smoke-point.
“高档”与“中档”煤油的根本差别在于前者比后者的发烟点高。
An essential difference between "premium" and "regular" grades of kerosine is that the former has a higher smoke-point.
“高档”与“中档”煤油的根本差别在于前者比后者的发烟点高。
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