Many groups can be added by nucleophilic substitution on a diazonium salt.许多基团可通过向得自胶的重氮盐作亲核取代而加以导入.Most direct substitution of groups bound to an aromatic nucleus is limited to diazonium salts.大多数连于芳核能被直接取代的基团仅限于重氮盐....
The kids had fun getting their hands coved in dough and flour.孩子们满手都是的面团与面粉,他们从中得到了很大的乐趣." Did you hear what that addle - coved wizard wanted us to do? "你有无听到那个猪兜巫师想我地做 乜?All junctions of floor, wall and ceilings shall b...
The poll was widely discredited after allegations of ballot rigging.选举舞弊的指控出现后，这次投票测验受到了广泛质疑。Her honour was discredited in the newspapers.她的名声被报纸败坏了。The reactionary authorities are between two fires and have been discred...
Larger drawings tend to require two or three exposures to cover them.较大的图画往往需要两三张胶片才能拍下来。How many exposures have you made?你拍过几张底片了?Exposures of rhythmically banded protore are common in the workings.在工作面中常见有韵律条带“原矿石”....
Daily facial exercises help her to retain the skin's elasticity.每天做面部运动帮助她保持皮肤弹性。They call rowing the perfect sport. It exercises every major muscle group.他们称划船是最佳运动，它可以锻炼每一处主要肌肉群。The emphasis is on developing fitne...
手术使我重获新生。The operation has given me a new lease of life.所有入学新生中约有40%在4年内毕业。About 40% of all students entering as freshmen graduate within 4 years.新生身上有一种朝气和热情。There was a freshness and enthusiasm about the new students....