名词
中文翻译：低级动物同义词
同义词：
['lower organism', 'lower life form']
例句：
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1. The lower animals are more likely to be affected by pollution.
低级动物更可能受到污染的影响。
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2. Some lower animals use venomous snakes as a defense mechanism.
一些低级动物使用毒蛇作为防御机制。
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3. Lower animals often have simpler nervous systems than higher ones.
低级动物的神经系统通常比高级动物简单。