地球的周日自转the diurnal rotation of the earth地球每天的自转the daily rotation of the earth on its axis地球既公转又自转.The earth revolves both round the sun and on its own axis....
此反应得到的产物为二烷基苯基丙二酸酯的碱金属盐衍生物.The immediate products of this reaction are alkali - metal derivatives of dialkyl phenylmalonates.以丙二酸做为调控剂,得到纤维状的碳酸钡晶体.Barium carbonate crystal with fiber structure was prepared from malonic a...
水中的一点点酸就会杀死鱼卵和小鱼.Fish eggs and young fish are killed by even a little acid in the water.鱼卵在马拉松运动员衣服上做 什么 ?What are fish eggs doing on a marathon runner's shirt?鱼卵比它们长成后的鱼致密250倍.Roe are 250 times more compact than th...
They were threatened with punishment if they disobeyed.他们受到恐吓，如若违抗就会受到惩罚。I was enraged to find they had disobeyed my orders.发现他们违抗了我的命令,我极为恼火.The director sailed in, demanding to know who had disobeyed his orders.主任盛气凌人地...
There are three types of airstream reaction engines.空气喷气反作用式发动机有三种.Noise will probably not hurt the airstream.噪音基本上不会影响气流.A westward moving airstream will, therefore, move equatorwards as it passes over the barrier.因此,向西...