The migratory bird is a host of the wetland.候鸟是湿地的主人.As a kind of migratory bird.啊,丹顶鹤不是一种候鸟吗.On 20 th, a migratory bird flies from the north woods, revolves the spacious square to circle.20日, 一只候鸟从北边的树林里飞来, 围绕着空旷的广场盘旋....
the upgradation of civic facilities in large cities大城市市政设施的改进I feel it is my civic duty to vote.我认为投票选举是我作为公民的义务.It's almost ten miles from here to the civic center.从这儿到市中心差不多有十英里....
Energy transformations go on constantly, all about us.在我们周围,能量始终在不停地转换着.New objects characterizing the structure of complex linear transformations are introduced.本文引入表征复线性变换结构的新对象.Chemical transformations occur.发生了化学转换。O...