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重点讲解：
1. amount to 总计；共计；
Our debts amount to over $1000.
我们的负债总共超过了1000美元。
2. appeal to 对…有吸引力；使感兴趣；
It may also appeal to the latent chauvinism of many ordinary people.
它可能也迎合了许多普通人心中的沙文主义情结。
3. center on （使）以…为中心;（使）注意力集中于；
Discussions were centred on developments in Eastern Europe.
讨论围绕着东欧的发展这一中心议题进行。
4. give off 释放，放出，发出（气体、热量、气味等）；
Many household products give off noxious fumes.
很多家用产品散发有害气体。
