Duckdata is a bibliographical database of North American waterfowl Anatidae and their wetlands habitats.水禽数据库是有关北美水禽和它们的湿地栖息地的书目数据库.Some waterfowl and fish are experiencing'feminization'from chemicals.一些水鸟和鱼类由于...
The pencil is in the pencil case.铅笔在铅笔盒里.He has a rubber in his pencil case.他铅笔盒里有块橡皮.You think your pencil case is full because you haven't lost any?你一直觉得你铅笔盒满满的是因为你的笔一直没丢 吗 ?...