“分级”的英语可以翻译为：classify，grade，[计] outline，[化] classification ...

一旦杂质沉淀下去，油就可以分级了。Once its impurities had settled, the oil could be graded.将在统一费用和分级费用之间作出选择。The choice will be between a flat-rate or a banded charge.木材按厚度分级.The timber is graded according to its thickness....