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.磷化氢是一种有毒气体,在空气中可以自燃.Phosphine is a toxic gas which ignites spontaneously in air.它们也可作为自燃点火成分,改进点火和重新点火性能.They also...
After a bath or shower rub down the whole body with a loofah.在洗澡或淋浴后，用丝瓜络按摩身体。Loofah body is uneven, the head also wore a yellow color of the flowers.丝瓜身上是凹凸不平的, 头上还顶着个黄颜色的小花....
I had to wear long sleeves to stop myself scratching.我只好穿上长袖衣服以免自己挠痒。It wasn't easy scratching out a living in those hard times.在那段艰难的日子里,糊口真不容易.If you keep scratching away at that spot, you'll break the skin.你...