- 難于獲得的材料
- difficult: adj. 1.困難的，(工作等)艱難的。 2.執(zhí)拗的，頑 ...
- obtain: vt. 得到，獲得，買到；達(dá)到(目的)。 obtain ...
- material: adj. 1.物質(zhì)的(opp. spiritual)。 ...
- difficult to machine material: 難加工的材料
- difficult-to-dump material: 難處理物料
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difficult to obtain material中文什么意思
- 難于獲得的材料
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