在这份题为《英脱对欧洲意味什么》的报告中，摩根士丹利圈划出英脱影响可能蔓延至欧洲余部的四大领域。
As part of the "What Brexit Would Mean For Europe" note, Morgan Stanley identifies four big areas where the impact of Britain leaving the EU would spill over to the rest of Europe.
键和余树之间的关系类似于圈和生成树之间的关系。
The relationship between bonds and cotrees is analogous to that between cycles and spanning trees.
历史沿革：名称起源于名叫余宾的牧童，相传他8岁时牧牛，有特异功能，牛不能走出其划定的圈吃草。
History: the name originated in the name of the vaquero Yubin, Legend has it when his 8-year-old cattle, a specific function, cattle can not be out of their designated circle grazing.
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