重点讲解：
1. pack up
打点（行装）；
例句：I'll be packing up my thing then.
那时候我在收拾行李。
例句：He was told to pack up all of his letters and personal belongings.
他被告知收拾好自己所有的信件和私人物品。
2. in charge of
主管；全面负责；统领；
例句：He's the chief, in charge of the whole show.
他是主管，负责全盘工作。
例句：Pilfering has stopped entirely since they put Angus in charge of the stores.
自从他们让安格斯掌管商店以来，小偷小摸就杜绝了。
3. tons of
大量的，很多的；
例句：The movie star received tons of fan mail.
那位影星收到了许许多多影迷的来信。
例句：There's always tons of scrap paper in Dad's office.
爸爸的办公室里总有大量的废纸。
