Directly below Alnitak, a close inspection will reveal the Horsehead Nebula.经过仔细查看就可以发现紧挨着参宿一的下方就是马头星云....the Great Nebula.猎户大星云A powerful telescope can resolve a nebula into stars.一架高性能的望远镜能从星云中分辨出星球来.Light takes about ...
The size of the nebula at this stage is inversely proportional to its mass.这个阶段星云的大小与其质量成反比。A powerful telescope can resolve a nebula into stars.一架高性能的望远镜能从星云中分辨出星球来.A nebula is really a discrete mass of innumerous stars...
the long-term effects of fertilizers肥料的长远影响Crushed bones make one of the best fertilizers.骨粉是最佳肥料之一.The use of pesticides and fertilizers produces cheap grain and vegetables.使用杀虫剂和化肥生产出廉价的谷物和蔬菜....
Lady racehorse owners have a reputation for capriciousness.赛马的女主人们出了名地性格多变。Jimmy collapsed on the floor, thrashing his legs about like an injured racehorse.吉米瘫倒在地板上，像匹受伤的赛马一样拼命踢蹬着双腿。Question 6 : Which out of the followin...