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重点讲解：
1. chop up 切碎；剁碎；
例句：Chop up three firm tomatoes.
拿3个硬西红柿切碎。
2. from then on 从那时起；
例句：From then on she knew she would win.
她从那时起就知道自己会得胜。
3. at once 同时；一起；
例句：You can't be doing two things at once.
不能一心二用。
4. used to do sth. 过去常常；过去曾；
例句：He used to do such work as he could pick up.
他惯常能够找到什么活就干什么活。
n. 渴望，热望 动词crave的现在分词
