例句：Heart failure led to her father's death.
心力衰竭导致她父亲的死亡。

2.have to 不得不

例句：You will not have to wait long.
你只要等一会儿就成。

3.at least 至少

例句：At least it should be.
至少应该是极少的。

4.coast guard 海岸警卫队

例句：The US Coast Guard says it rescued more than 100 Haitian refugees.
美国海岸警卫队说他们营救了100多名海地难民。
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