例句與造句

1. Distribution power systems in our country are almost ineffective grounded systems , it is called small current neutral system ( scns ) . but the unique characteristics of ground - faults of the scns make it difficult to locate exactly the fault point of transmission lines
   我國大多數(shù)配電網(wǎng)均采用中性點(diǎn)非有效接地系統(tǒng),即小電流接地系統(tǒng),但由于該系統(tǒng)自身的特點(diǎn),其單相接地故障的檢測(cè)定位成為長期困擾電力工作者的一個(gè)棘手問題。
2. It's difficult to find scns in a sentence. 用scns造句挺難的