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