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重点讲解：
1. part of 一些；部分；
Part of the roof has caved in.
屋顶有一部分塌了下来。
2. bring down 降（价）；
We aim to bring down prices on all our computers.
我们打算降低我们所有计算机的价格。
3. go missing 失踪；
Children often go missing in places of high population density, such as shopping malls, railway stations and amusement parks.
儿童容易在购物商场、火车站和游乐园等人口密度高的场所走失。
4. be willing to do sth. 乐意的；愿意的；
I am willing to admit that I do make mistakes.
我愿意承认我确实会犯错。
n. 密集，密度，透明度
