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.Many groups can be added by nucleophilic substitution on a diazonium salt.大多数连于芳核能被直接取代的基团仅限于重氮盐.Most direct substitution of groups bound to an aromatic nucleus is limited to diazonium salts....
The old librarian illuminated some old books and manuscripts.这个老图书馆员把一些古书和旧抄稿加上各种装饰.The librarian entered a new book in the catalogue.图书管理员把一本新书编入目录.You may deposit your returned books with the librarian.你可以把要还的书留在图书管理员处...
How can you live in this pigsty?你怎能这住在这样肮脏的屋里 呢 ?He makes a pigsty of the kitchen whenever he does the cooking.他一做饭就把厨房弄得很脏.They have mucked out the pigsty.他们已经把猪栏打扫过了....
Domestic chickens are descended from jungle fowl of Southeast Asia.家鸡是由东南亚原鸡演变而来的。I have to feed the chickens and hoe the potatoes.我得喂鸡，还得为马铃薯锄草。I don't want to count my chickens before they are hatched.我不想高兴得太早。...