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...
Old roads used to be paved with round stones to help the horses to walk easily.旧时的道路常用圆石铺路面,使马匹易于行走.The floor holding pen shall be paved with impervious materials and have good drainage.地面应采用不渗透材质铺设,排水良好.May all your day...
到1922年，公学的注册学生数接近16,000。By 1922 the public schools had an enrolment of nearly 16,000 students.这艘船的注册编号刻在前舱的左舷上。Her official number is carved on the port side of the forecabin.他们于1927年4月7日在帕丁顿登记处注册结婚。They were married on ...