以下为句子列表：
英文: Many patient taxonomists from several European countries and America then sieved through litres of muddy gravel with microscopes and pairs of tweezers to see what treasures had been captured.
中文: 来自欧洲几个国家和美国的许多分类学家耐心地用显微镜和镊子对数以升计、沾满烂泥的沙砾进行筛分，来看看什么样的宝贝被铲了上来。
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英文: Subdivide the African population, as some taxonomists propose, and perceptions of scarcity may shift.
中文: 如果把非洲象细分下去，就像物种分类学家所做的那样，人们对稀缺的敏感度也随之降低了。
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