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1·The main drain was blocked.

主下水道被堵住了。《柯林斯英汉双解大词典》

2·By adjusting main drain off water pump flow quantity, this paper makes main drain off water equip running safe, economy, saving investment.

通过调整矿井主排水泵流量，使矿井主排水设备安全经济运行，节约投。

3·When SpongeBob and Patrick hear the story of The Main Drain, they try looking for it. It gets hard when everyone keeps getting in their way.

海绵宝宝和派大星听说了“总排水管”的故事，二人想找到它，但其他人总找各种理由妨碍他们。

4·The main breeding sites were pools, drain, waterbeachs and tyres.

重要滋生环境为积水池、排水沟、积水滩和轮胎。

5·The spectra of the main elements of the drain-source voltage can be found in Fig. 20.

图20描述了漏源极电压主要原理产生的电磁干扰频谱。

6·The main problem on the export rebate system of our current agricultural products is a severe tax drain of agricultural products; a low export rebate rate for agricultural products.

我国现行农产品出口退税制度中存在的主要问题是：农产品征税过程中存在较为严重的税收流失现象；农产品出口退税率偏低、退税不及时。

7·The channel resistance and the source-drain contact resistance of OTFT were investigated, and the results indicated that the latter is the main factor to affect the electric performances of OTFTs.

研究了有机薄膜场效应晶体管的源漏接触电阻和沟道电阻对器件性能的影响，结果表明接触电阻是影响器件性能的主要因素。

8·Water Wells of clay, and drain well across the road from main part most complete construction units.

其中雨水井，沉泥井，过街排水管部分多数由道路主体施工单位完成。

9·This article describes the situation of blind drain used in the construction of Laoyemiao-Jining Expressway, and the main form of blind drains.

介绍了老集高速公路建设中使用的盲沟情况，描述了老集高速公路盲沟的主要形式。

10·The whole city drainage system program is as follows: rain water wells road, clay and drain well across the street and drainage inspection wells and underground drainage main lines.

市政整体排水系统程序如下：路面雨水→雨水井→沉泥井→过街排水管→排水检查井→地下排水主干线。