The carbon microfiltration membranes were prepared by pyrolysis of a home - made thermosetting phenol - formaldehyde ( PF ) resin .实验合成了球形热固性 酚醛树脂 微粒,并以此为原料制备了微滤炭膜.The preparation and property of urea - formaldehyde resi...
The material is readily prepared by reaction of formaldehyde and hydrazine.这种物质很容易由甲醛和肼反应而得到.Formaldehyde slowly inactivates many viruses.甲醛能慢慢使多种病毒失去活性.Sulfur dioxide and formaldehyde both produce irritation.二氧化硫和甲醛都可产生...
当卵孵化后，幼虫取食寄主的鲜肉。When the eggs hatch the larvae eat the living flesh of the host animal.人们用光学显微镜,在受侵染的寄主中观察到这些微生物.Many of these microbes were observed in the infected host by light - microscope.致病的细菌通常在罹病的寄主的组织里发展.Disease...
屋子里弥漫着皮革的气味。The smell of leather permeated the room.他的形象使人联想起旧皮革的气味 、 旧钞票和等级.His image is redolent of the smell of old leather, old money and class.为了保持皮革的柔韧性，可能两三周就要上一次油。The leather may need to be oiled every two to thr...
商业街的零售商报告说圣诞节前销售量显著提高.High street retailers reported a marked increase in sales before Christmas.这班公共汽车经过商业街 吗 ?Is this the bus that goes by the mall?我们的左面是店窗明亮的铺子和商业街廊的入口.On our left were the shops, their windows lighte...
...a series of monumental disappointments.一连串的巨大失望I take no real interest in monumental sculpture.我对高大的雕塑没什么兴趣。Yo - Yo Ma , one of the greatest cellists, in Bach's monumental works for solo cello.马友友, 国际最顶尖的大提琴演奏家之一...