The ionosphere is that region of space contatining electrically charged species.电离层是指含有带电物质的空间区域.Its upper limit is determined by the conditions in the ionosphere.其上限由电离层的状态而决定.Rockets and artificial satellites can go fa...
Sinonovacula constricta ( Lamarck ) , a kind of mollusks , is important in marine aquaculture.缢蛏 ( Sinonovaculaconstricta, Lamarck)历来是我国沿海重要的经济养殖贝类.Mytilus galloprovincialis Lamarck can not only spend the summer but also...
Leah had chosen to stay with Nim.莉娅提出要跟尼姆呆在一起.Better Leah and Benjy should know than have It'sprung upon them suddenly in a crisis.还是让莉娅和本杰知道的好,免得事情到了不可挽回的地步突然摆在他们面前.Tonight, Daisy could tell Leah that shes going ba...