These are two examples of a continent-wide phenomenon; African cities are struggling to cope with an unprecedented influx of people.
这仅仅是一个席卷整个非洲大陆的现象中的2个例子；非洲城市正疲于应对始料未及的人口涌入。
3
Whether a similar difference in continent-wide susceptibility explains why swine flu is spreading in the United States but standing still in Europe will take a while to figure out.