慢速英语:美国西海岸棱皮海龟数量大幅下降

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nest – v. to live in a nest (a home built by animals where they can lay eggs and live)

ecosystem – n. everything that exists in a particular environment

decline – n. a situation in which something becomes less in amount, importance, quality or strength

reverse – v. to change a situation or the order of things so that it becomes the opposite

extinct – adj. when something (such as a plant or animal species) has died out completely