Câu ví dụ #1
1. "We observed on five occasions that the elephants went without sleep for up to 46 hours," said the study, noting that sometimes the elephants traveled significant distances, perhaps to avoid predators, poachers, or bulls seeking to mate.
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2. Accidents involving helicopters and small planes are frequent in Siberia and far eastern Russia, where air transport is commonly used to cover vast distances.
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