我们认为的最佳的对比度是80%,这可以作为一般的经验值.We aim for 80 % contrast as a general rule of thumb.对比度定义为两个光密度之比.In this definition, the contrast is given by the ratio of two light densities.实验结果表明:该方法可以有效地实现对比度增强 、 噪声抑制和边缘保护.Experimental ...
"Don't let that get you down," he said ruffling Ben's dark curls.“不要为那个感到沮丧，”他一边说，一边抚弄着本乌黑的卷发。He was long-limbed and dark-eyed, with a mop of tight, dark curls.他四肢修长、眼睛乌黑发亮，留着一头蓬乱浓密的黑色卷发。Erica was solemn, pulli...
I drove gingerly past the security check points.我战战兢兢地开车经过安检站。She gingerly picked the flower.她小心翼翼地摘下那朵花.The passengers stepped down gingerly from the narrow gangplank.乘客们战战兢兢地从狭窄的跳板上走下船来.The snake charmer reached out gi...
就在那时，我恰好环顾了下四周。It was just then that I chanced to look round.这座城市建在岩石上，四周筑有城墙。The city was walled and built upon a rock.一些小东西在帐篷四周的草丛里窸窸窣窣地动着。Small things stirred in the grass around the tent....
该体系的永恒性不受任何事物的影响.Nothing threatens the permanence of the system.全全地球的农民们都明白季节的很重要性和永恒性.Farmers all over the globe knowinging the importance and immutability the seasons.他争论说,永恒性才是错觉, 只有变化才是真实的.He argued that permanence i...
The corresponding reaction of acetaldehyde is subject to general base catalysis.乙醛相应的反应服从广义的碱催化.During alcoholic fermentation acetaldehyde acts as a hydrogen acceptor instead of oxygen.在这个过程中乙醛取代了氧作为氢的受体.Alcohol dehydrog...