- 难于获得的材料
- difficult: adj. 1.困难的，(工作等)艰难的。 2.执拗的，顽 ...
- obtain: vt. 得到，获得，买到；达到(目的)。 obtain ...
- material: adj. 1.物质的(opp. spiritual)。 ...
- difficult to machine material: 难加工的材料
- difficult-to-dump material: 难处理物料
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difficult to obtain material中文什么意思
- 难于获得的材料
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