他们把黑土掺上沙子.They mixed the sand with the black clay.当表层黑土全部被冲走之后, 农民们就向西部转移,建立新的种植园.When the black topsoil was all washed away, farmers moved westward and started new plantations.洋葱以及稻米生长在三角洲附近的黑土里.Onions and rice grow in ...
Alkyd resins are often modified with other resins to obtain specific properties.多元醇酸树脂通常用其它树脂改性以获得特殊的特性.Chemicals Stocks, Ferroalloy and Products, PVC Resins, Plastic Raw Material, Chemical Supplies.采购产品股票, 铁合金和产品, PVC树脂...
他固执地扬起下巴, 一副不肯罢休的样子.His jaw jutted stubbornly forward; he would not be denied.莱恩固执地一言不发.Len remained obstinately silent.她固执地坚持认为自己是对的，别人都是错的。She, in her pig-headed way, insists that she is right and that everyone else is...
起初我们着手研究的是看起来似乎最简单和最明显的滤波器.We started with what seemed the most simple and obvious filter.在适当条件下,多层膜还可作滤波器.Under appropriate conditions a multilayer may also be employed as a filter.这个信号送到滤波器 - 放大器,它是由变压器耦合到视频检波器的.The si...