I can affirm that he is tenacious and pertinacious as are few.我可以肯定,像他那样不屈不挠、百折不回的人是十分罕见的.Questions buzzed in his head like pertinacious bees.一连串问题在他脑子里盘旋着,就象纠缠不休的蜜蜂.The ideas of my friend Watson, though limited are exce...
蒸发的物质能再凝结, 形成新的粒子.Evaporated material can recondense, forming new particles.吸气离子泵通过剩余气体与蒸发的金属之间的化学反应减少了内腔的压力.Getter - ion pumps decrease chamber pressure by chemical reaction of residual gases with an evaporated metal.它通...