同根派生 hard coal相關(guān)詞英漢例句Soft coal burns with more flames than hard coal.煙煤燃燒時(shí)火焰較無煙煤多。We also supply blind coal and soft coal from China and Indonesia.煤炭產(chǎn)品主要是無煙煤與有煙煤等。hard coal更多例句