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Aggravate & worsen&exacerbate
1.aggravate -
1.1-使病情加重，活着使不开心，不好的事恶化。
1.2-
eg-
pollution can aggravate asthma.
2-worsen
2.1-强调比以前变的更坏。
2.2－
eg:
her health has worsened considerably sincewe last saw her.
3.exacerbate-
3.1-特指病情活着问题的恶化。
3.2-
eg:
his aggressive reaction only exacerbated thesituation.
