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重点讲解：
1. part of 一些；部分；
These buildings are part of our national heritage.
这些建筑是我们民族遗产的一部分。
2. come by 弄到；得到；
How did you come by that cheque?
你是怎么弄到那张支票的？
3. pay for 付；支付；
They lacked the wherewithal to pay for the repairs.
他们缺少维修费。
4. keep up with 跟上；
It is difficult to keep up with the rapid pace of change.
跟上迅速的变化是很困难的。
n. 圈子，圆周，循环
v. 环绕，盘旋，包围
