动物起源与繁殖

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The tradition of tea ceremonies originates in ancient China.

茶道传统发源于古代中国。

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Modern English derives over half its vocabulary from Germanic and Romance roots.

现代英语超过一半的词汇源自日耳曼语和罗曼语词根。

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Many respiratory diseases stem from prolonged exposure to air pollution.

许多呼吸道疾病起源于长期暴露于空气污染。

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Scientists have identified a common ancestor shared by humans and chimpanzees.

科学家已确认人类与黑猩猩共有的一个共同祖先。

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She is a direct descendant of the Mayflower pilgrims who settled in Plymouth.

她是乘坐“五月花号”抵达普利茅斯的清教徒移民的直系后代。

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Parental care significantly increases the survival rate of mammalian offspring.

亲代抚育显著提高哺乳动物后代的存活率。

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Within the student population, researchers identified a high-risk subgroup for anxiety disorders.

在学生群体中，研究人员识别出一个焦虑障碍高风险子群。

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Farmers must carefully regulate what they feed livestock to ensure food safety.

农民必须严格控制喂养牲畜的饲料以确保食品安全。

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Selective breeding has produced hundreds of dog breeds with distinct traits.

选择性繁殖已培育出数百个具有不同特征的犬类品种。

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Closely related species sometimes interbreed, producing hybrid offspring like mules.

亲缘关系较近的物种有时会异种交配，产生骡子等杂交后代。

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These two plant species can hybridise naturally in the wild.

这两种植物物种在野外可以自然杂交。

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Bacteria proliferate rapidly in warm, moist environments.

细菌在温暖潮湿的环境中迅速增殖。

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Chromosomal abnormalities often lead to complete sterility.

染色体异常常导致完全不生育。

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The male peacock displays his tail to attract a mate.

雄性孔雀展开尾羽以吸引配偶。

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Complex courtship rituals help ensure reproductive success in many bird species.

复杂的求偶仪式有助于确保许多鸟类的繁殖成功。

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Sea turtles return to their natal beaches to lay eggs.

海龟会回到出生海滩产卵。

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The chicks will hatch from their eggs after approximately 21 days.

小鸡将在约21天后从蛋中孵出。

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The mother robin fiercely defends her brood against predators.

知更鸟妈妈会激烈地保护她的一窝幼鸟免受捕食者侵害。

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Salmon migrate upstream to spawn in freshwater gravel beds.

鲑鱼洄游至上游，在淡水砾石床中产卵。

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This orchid takes five years to become fully mature and flower.

这种兰花需五年才能完全成熟并开花。