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重点讲解：
1. be able to do sth. 可以…的，能够…的；
We are able to make more informed choices about how we use drugs.
我们能够更加明智地选择如何使用药物。
2. permit sb. to do sth. 允许；准许；
Cash machines permit you to withdraw money at any time.
取款机可让你随时取款。
3. at least 至少，起码；
It means that all the options are at least on the table.
这就意味着，至少所有的选择都已经摆到了桌面上。
4. by oneself 单独；独自；独力；
He was doing it all by himself.
他独自一人在做那件事。
