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重点讲解：
1.get rid of摆脱；除去
Fortunately, like most thyroid cancer patients, she needed only a single dose of radiation to get rid of the cancer.
幸运的是，和大多数罹患甲状腺癌的患者一样，她只需要单剂放疗即可摆脱癌症的困扰。
2.bring down降低；使倒下
Opinion polls show that most Americans have lost hope that politicians can bring down the high unemployment rate.
民调显示，大多数美国人已经对政治家能够降低高企的失业率失去了希望。
