The skin of her cheeks tautened.她紧绷着脸.The shadows in the room deepened. It grew frightfully a tense stillness that tautened my nerves.屋里的阴影更深了,静得吓人,这种紧张的寂静令我的神经难以忍受.Her whole body tautened violently.她全身紧绷得厉害。Her whole bo...
你分组件买这个书橱,再把它们卡榫对准组合在一起.You buy this bookcase in sections and slot them together.榫锯是一种特殊的墨线戽.A mortice gauge is a special type of marking gauge.配置于推台锯,斜榫机,双端铣 、 摇臂锯.To be equipped on the table saw, and recommended for dr...
由二苯并-1,3-二氧杂 - 环辛烷 -2- 羧酸经两步反应制得, 总收率70%.It was prepared by the reaction of 12 H - dibenzo [ d , g ] [ 1,3 ] dioxocin - 6 - carboxylic acid with acetoxime.地衣是一类独特的生物有机体,其体内合成了多种特殊的次生代谢产物,主要为缩酚酸、缩酚酸环醚 、 缩酚酮、二苯并呋喃等类化合物.A l...