docstr: Converts a tree to string without translations.
  
  Examples
  ========
  
  >>> from sympy.abc import x, y, z
  >>> from sympy import sin
  >>> from sympy.plotting.experimental_lambdify import Lambdifier
  >>> str2tree = Lambdifier([x], x).str2tree
  >>> tree2str = Lambdifier([x], x).tree2str
  
  >>> tree2str(str2tree(str(x+y*sin(z)+1)))
  'x + y*sin(z) + 1'
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code: def tree2str(cls, tree):
      """Converts a tree to string without translations.
  
      Examples
      ========
  
      >>> from sympy.abc import x, y, z
      >>> from sympy import sin
      >>> from sympy.plotting.experimental_lambdify import Lambdifier
      >>> str2tree = Lambdifier([x], x).str2tree
      >>> tree2str = Lambdifier([x], x).tree2str
  
      >>> tree2str(str2tree(str(x+y*sin(z)+1)))
      'x + y*sin(z) + 1'
      """
      if isinstance(tree, str):
          return tree
      else:
          return "".join(map(cls.tree2str, tree))
  
imports: import re
  from sympy.core.numbers import I, NumberSymbol, oo, zoo
  from sympy.core.symbol import Symbol
  from sympy.utilities.iterables import numbered_symbols
  from sympy.external import import_module
  import warnings
label_desc: Use image node_id 6 for calling the Lambdifier obj's underlying member method code with example usage: obj.tree2str(cls, tree) and returns: tree, str