main drain drain system 主泄水系统
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。
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。
Nowadays, one of the main reasons for college teachers working without all their energies, even one cause of the brain drain in colleges, is there is un-rational incentive system.
目前，激励机制扭曲是造成我国高校教师积极性不高，甚至发生人才流失的主要原因之一。
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