If you need to, label things, but the main thing you should do is designate a spot for every item you decided to keep and make sure that it stays there, or goes back there when you're done using it.
如果需要的话，可以利用一些标签帮助识别。不过你主要应该做的事情是决定每一件东西的去留，并确保它们在它们应在的位置或在你用完它们后放回原位。
To widen that interval, select the Items for Purchase label and press the down-arrow key on your keyboard to move the item to its proper location.
为了扩大这个间隔，选择items for Purchase标签并按下键盘上的向下箭头键将该项目移动到它的正确位置。
In line 38, a new listitem widget is created with its label value and id set for each stock item, and is appended to the listbox as its children widgets.
第38行，使用其标签值和ID集合为每个股票项创建一个新的listitem小部件，并附加到listbox上作为它的子部件。
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