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如果你热爱一件事时,你就会为它克服一切困难。
我选择一块大理石,然后砍掉我不需要的部分。
The concept of legal validity is crucial for understanding the nature of law.
The principles of learning are universal across species.
Theorems are eternal; their proofs are ephemeral.
We usually see only the things we are looking for- so much so that we sometimes see them where they are not.