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重点讲解：
1.on the heels of紧随…之后
The crisis is particularly damaging because it comes on the heels of global food and fuel crises that have already exhausted the capacity of developing countries to cope with price shocks.
这场危机特别具有破坏性，因为它紧跟着全球食品与燃料危机而来，后者已经耗尽了发展中国家应对价格冲击的能力。
2.because of由于
His business went under because of competition from the large corporations.
由于大公司的竞争，他的生意陷入了困境。
