In 1957, the Soviets launched Sputnik 1 into outer space.1957年，苏联人将“斯普特尼克1号”人造卫星送入了外层空间。They have been visited by creatures from outer space.有外星人拜访了他们。radio waves from outer space来自外层空间的无线电波...
The adventitious root is triarch, and has the secondary structure.不定根为三原型, 具次生结构.Stem erect or floating, elongate, 5 - angled, nodes often with adventitious roots.茎直立或漂浮, 拉长, 5具角, 节通常具不定根的.It required more than 15 to ind...