Sequence
 Usage
• Sequence[ ,  , ... ] 表示一组自动接合到任意函数的参数.
Notes
• 例如: f[a, Sequence[b, c]]  . • 除具有SequenceHold 或 HoldAllComplete属性的函数外,Sequence对象在所有函数中将自动被压平.
 Further Examples
Sequence is often used with Apply (short prefix form: @@) for splicing elements into an enclosing expression.
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Define a set of elements to be used as limits of integration.
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Since NIntegrate normally holds its elements unevaluated, it is necessary to use Evaluate to force the evaluation.
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This clears the definition.
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