例句與造句

1. The conventional methods for mining such seams including the longwall blasting and block caving suffer form the drawbacks of being low in recovery , high in labor intensity and low in efficiency . after shifting to the use of the fully - mechanized extraction system by the zhaogezhuang branch mining industry co . of kailuan ( group ) co . , the mining of the pitching seams has met with remarkbable social and economic result
   針對大傾角煤層長壁炮采、落垛等采煤方法,存在回采率較低、員工勞動(dòng)強(qiáng)度大、高產(chǎn)高效受限及安全等諸多問題,開灤(集團(tuán))趙各莊礦業(yè)分公司在探討大傾角煤層采煤工藝的改革及實(shí)踐大傾角煤層綜合機(jī)械化采煤過程中,取得了較好的社會(huì)經(jīng)濟(jì)效益。
2. It's difficult to find mechanized extraction in a sentence. 用mechanized extraction造句挺難的