环面可由矩形把其两对对边分别重叠起来而得到.A torus can be obtained from a rectangle by identifying opposite sides.所以就拓扑学而言, 球和环面是不同的东西.Topologically, then, a sphere and a torus are distinct entities.平面包络环面蜗轮副具有优良的啮合性能,它是一种具有广阔应用前景的传动形式.Worm ...
Citric acid can be extracted from the juice of oranges, lemons, limes or grapefruit.柠檬酸可以从橙汁、柠檬汁、酸橙汁或者柚子汁中提取。This compartment contains citric acid at a concentration up to 24 times higher than the cytoplasm.这种间隔中所含柠檬酸浓度比...
Their excellent survival during autolysis in vitro and ischemia in vivo is consistent with this.与此一致是,在体外自溶时和在体内局部贫血时,它们出色地幸存下来.Autolysis The self - destruction of cells by digestive enzyme activity.自溶现象:通过消化酶的活力来破坏自己细胞的...
语言是永恒的. 你应当说出或写下它们,获知它们的永恒.Words are timeless. You should utter them or write them with a knowledge of their timelessness.这些说出的或写下来的声音, 我们便称之为文字.These sounds , whether spoken or written in letters, we call words.应该把这个做完(...
A 10 to 15 percent deviation is considered acceptable.10%至15%的离差是可以接受的。deviation from the previously accepted norms违背事先接受的准则A minimal error or deviation may result in wide divergence.失之毫厘,谬以千里....
Primates are alert, inquisitive animals.灵长目动物是机灵 、 好奇的动物.Consciousness or cerebration has been said to have emerged in the evolution of higher primates.据说意识或思考在较高级灵长类的进化中已出现.The smallest primates in West deciduous forest...
There are no fortresses that Bolsheviks cannot capture.布尔什维克是无坚不摧的.The French constructed a series of fortresses from Dunkirk on the Channel coast to Douai.法国人在从敦克尔刻到杜埃的英吉利海峡沿岸修筑了一系列要塞。They will establish impregnable for...
采用质子微探针技术,分析单个大气气溶胶颗粒物.Single aerosol particles inin winter 2004 were analyzed by proton microprobe.微探针的刻划加工可以分为两个过程, 即 压入过程和刻划过程.The micro - machining by micro probe can be divided into two processes: indentation and sc...