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重点讲解：
1. carry out 实施；执行；实现
She didn't think that he was well enough to carry out such an exacting task.
她认为他身体不是很好，不能执行如此艰巨的任务。
2. be important to 对...来说是重要的
Your friendship is very important to me.
你的友情对我非常重要。
3. be linked to 与...有关联
Exposure to ultraviolet light is closely linked to skin cancer.
受紫外线照射与皮肤癌紧密相关。
4. claim responsibility for 宣称对...负责
Nobody has claimed responsibility for the bombing.
没有人声称对爆炸事件负责。
