difficult separation coal中文是什么意思

difficult coal 難洗煤
coal separation 選煤
separation coal 精選煤。
be difficult of 難于, 不易
be difficult to 很難去……
difficult adj. 1.困難的，(工作等)艱難的。 2.執拗的，頑固的。 a difficult disposition 執拗的性情。 difficult of access 難接近。 difficult to answer 難答。
it’s not difficult 不難
that’s difficult 那很困難
separation n. 1.分離；分類；分開。 2.隔開；間隔；脫離。 3.(夫婦的)分居。 4.分隔物。 5.【化學】離析；析出；釋出。 6.【礦物】分選。 7.【電學】(導線的)間距；間隙。 8.【航海】(裝貨的)隔票墊料。 9.【地質學；地理學】(斷層引起的)離距。 separation of powers (政府)權能的分立。 contact separation 【電學】接點間隙。 judicial separation 【法律】(法庭判定的)夫婦分居。 n. -ist ＝separatist.
of coal 煤氣化
on coal 靠近煤礦
a difficult catch 難接的球
a difficult part 超出了她的能力; 老師讓作者讀的這一部分
a difficult problem 一道難題
a difficult question 一個難的問題
a little difficult 有點困難
be difficult of approach 指地方難到達的
be difficult to deal with 難于應付
be difficult to talk 說話困難
be in a difficult situation 處境困難
difficult area 礙航區
difficult asthma 難治性哮喘
difficult calving 牛難產
difficult case 難案

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