No simple non-recursive procedural expression accesses all elements, although many libraries include helper functions for walking the tree.

简单的非递归过程表达式并不能访问所有的元素，尽管许多库都包含有帮助功能，可以用于遍历树。

youdao

No simple non-recursive procedural expression accesses all elements, although many libraries include helper functions for walking the tree.

简单的非递归过程表达式并不能访问所有的元素，尽管许多库都包含有帮助功能，可以用于遍历树。

youdao