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法律的概念涉及主要规则和次要规则的结合。
The will to learn is an intrinsic motive, one that finds both its source and its reward in its own exercise.
The dead are always looking down on us, they say. But we don't look back.
遗传密码是一组规则,通过这些规则,遗传物质(DNA或RNA序列)中的信息被活细胞翻译成蛋白质(氨基酸序列)。