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重点讲解：
1. go out 外出；
I don't go out whenever it rains.
天一下雨，我就不出门了。
2. at least 至少，起码；
At least they have a real chance to find work.
至少他们的确有找到工作的机会。
3. know about 了解，掌握；
Now I want to know about this thing from beginning to end.
我现在想源源本本地了解此事。
4. check out 检查；
This photocopy machine is not working properly. Could you check out the problem?
这台复印机不正常工作了，你检查一下好吗？
n. 进口，进口商品，意义
v. 进口，输入
