The sorting is performed by iterating through the tree's items (lines 37 to 39).
排序通过对树项目进行迭代(第37 - 39行)来执行。
Listing 4 shows the full implementation of the Basic tree with columns, in which the column-sorting capability is added in lines 27 and 33.
清单4展示了具有列的基本树的完整实现，其中，列排序功能添加在第27和33行。
Shipping lines, logistics companies and warehouse operators say costs spur customers worldwide to move the sorting process for goods away from consuming countries.
船运公司、物流企业和仓储运营商表示，成本因素促使全世界的客户都将商品分类过程从消费国转移出去。
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