The areas are sealed off and ringed by troops.这些地区被军队封锁包围了。Helicopters with searchlights swept the park which was sealed off.直升飞机的探照灯来回扫射这个被封锁的公园。Police and troops sealed off the area after the attack.袭击发生后警察和士兵将该区域封锁。...
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....
It has separate microphone pickups and amplifiers for each string.每根琴弦都有各自独立的拾音器和放大器.Transducers at various times have also been called pickups, or sensing elements.有时,传感器也被称为检拾器或敏感元件.The coach driver made several pickup...
Her voice, small and fluting, stopped abruptly.她细小但却抑扬顿挫的声音戛然而止。Fluting andsing ing are heard all night.笙歌不夜.And the thrushes are in song there, fluting from the nest.还有百舌鸟在合唱, 从巢中如奏长笛....