较轻的推进器采用液态氢, 较重的采用自燃推进剂.The lighter version used liquid hydrogen, the heavier used hypergolic propellants.这个工厂为弹道导弹生产推进剂。The factory produces propellant for ballistic missiles.挤压 式 发动机对推进剂中溶解的气体特别敏感.Pressure - fed engine...
The destructive and malignant neoplasms of chorionic epithelium often arise from hydatidiform moles.破坏性和恶性的绒毛膜上皮癌往往是葡萄胎所引起.Moles dug tunnels under the lawn.?鼠在草地下面打洞.Moles have powerful forefeet for digging.鼹鼠的前足非常有力，擅长挖...
The film opened to healthy box office receipts before rapidly falling off.这部影片的票房收入开始的时候持续上涨，但是后来急剧下降。Children in evacuation centres are falling prey to disease.疏散中心的孩子正受到疾病的折磨。Many school buildings are unsafe, and some ...