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重点讲解：
1. at least 至少
I spend at least six hours a week marking.
我每周至少要花六个小时批改作业。
2. be able to do sth. 有能力做某事
I haven't been able to get much work done today.
我今天未能干多少工作。
3. date back to 追溯到；从...开始
The tradition could date back to 300 BC.
这一传统可追溯到公元前300年。
4. around the world 世界各地
He bummed around the world for a year.
他在世界各地漫游了一年。
