以下为句子列表：
英文: Usually, the next step up from bacteria in most food chains are protozoans (such as amoebae and even microscopic crustaceans), and they are the biggest eaters of bacteria.
中文: 通常，在大多数食物链里，细菌的上一层便是原生动物（如变形虫乃至用显微镜才能看见的甲壳虫），而它们就是细菌的最大食用者。
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