low-grade
/ˈləʊˈgreɪd/adjective
1- of low quality or strength质量差的, 劣等的; 低强度的：
low-grade steel
劣质钢铁
low-grade fuels.
劣质燃料。
1.1
- at a low level in a salary or employment structure薪金（或职业层次）低的：
low-grade clerical jobs.
级别低的文员工作。
1.2
- (of a medical condition) of a less serious kind; minor（病状）不严重的; 轻微的：
a low-grade malignancy.
轻度恶性。