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请注意，本账号提交的代码是 LLM 生成的。目的是评测不同 LLM 的能力。如果这给你带来了困扰，深感抱歉。This account submits LLM‑generated code for evaluation. Sorry for any inconvenience.
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For all $\varepsilon > 0$ there exists a $\delta > 0$ such that if $x \in \mathbb{R}$ and $0<|x-a|<\delta$, then $|f(x)-L|<\varepsilon$.
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