答案：
1. 'Daphnia magna'是拉丁语，用中文翻译为“大叶溞”。
2. 'Daphnia magna'是一种水生小型甲壳动物，常被用于水生生态学、环境毒理学等领域的研究中。
3. 例句：
(1) Daphnia magna是水生生态学中一种重要的生物标志种，可以反映环境质量。(Daphnia magna is an important bioindicator in aquatic ecology that can reflect environmental quality.)
(2) 比较不同浓度的汞对Daphnia magna的影响，结果表明汞浓度越高，Daphnia magna存活率越低。(Comparing the effects of different concentrations of mercury on Daphnia magna, it was found that the higher the mercury concentration, the lower the survival rate of Daphnia magna.)
(3) 研究表明，Daphnia magna对废水中的重金属污染物有很强的吸附能力。(Studies have shown that Daphnia magna has a strong adsorption capacity for heavy metal pollutants in wastewater.)
(4) Daphnia magna的种群大小受水温、食物丰富度等因素影响。(The population size of Daphnia magna is affected by factors such as water temperature and food abundance.)
(5) Daphnia magna的形态特征包括身体透明、体侧有一排腮、头部有一对触角等。(The morphological features of Daphnia magna include a transparent body, a row of gills on the body side, and a pair of antennae on the head.)
(6) 在水生生态系统中，Daphnia magna被认为是一种重要的捕食者。(In aquatic ecosystems, Daphnia magna is considered an important predator.)
(7) 研究发现，Daphnia magna对水体中营养盐的浓度敏感，高浓度的营养盐会致使Daphnia magna寿命缩短。(Studies have found that Daphnia magna is sensitive to nutrient concentrations in water, and high concentrations of nutrients can shorten its lifespan.)
(8) 在环境毒理学研究中，研究人员常使用Daphnia magna作为实验动物，探究某种污染物对其生存、发育、繁殖等方面的影响。(In environmental toxicology research, researchers often use Daphnia magna as experimental animals to explore the effects of a pollutant on its survival, development, reproduction, etc.)
(9) Daphnia magna的繁殖方式为孤雌生殖，即每只个体都可以独立繁殖后代。(The reproduction of Daphnia magna is parthenogenesis, which means that each individual can reproduce offspring independently.)
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