Depth
 Usage
•Depth[expr]等于用以确定 expr的任意部分所必需的指标的最大值加 1 .
Notes
• 原始对象的深度为 1.
• Depth的计算不把表达式的头包含在内.
 Further Examples
The depth of an expression is one more than the level of its most deeply nested atom.
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This is the same as the number of levels in the expression as shown by TreeForm.
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Instead of counting brackets or levels, we can calculate the depth. We start by replacing all the atoms with the same symbol, say xx.
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Now we can easily find the positions of all the atoms in the original expression.
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The depth is  more than the maximum number of indices needed to specify those positions.
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We clear the definition.
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