重点讲解：
1. ban sb. from sth./doing sth. 禁止（做某事）；
例句：She thinks we shouldn't ban kids from playing video games because forbidden fruit is always more attractive.
她认为她们不应该禁止儿童玩电子游戏，因为被禁之物往往更加具有吸引力。
2. apply to 适用；适合；
例句：This rule applies to freshmen only.
这条规则只适用于大学一年级学生。
3. hand in 上交；
例句：They handed in their war booty to their leader.
他们把战利品上缴给了上级。
4. be engaged in 从事…的；忙于…的；
例句：Some of them are engaged in advanced studies.
他们有些人在进行高级研究工作。
5. remove from 免除（职务）；
例句：The magistrate was removed from office.
治安法官被免职。
6. prevent sb. from sth./doing sth. 阻止；制止；阻碍；
例句：Only a serious mischance will prevent him from arriving tomorrow.
只有碰上极倒霉的意外变故,他明天才会来不了。
