一条沟作为南边那块地产的边界。
每当边界巡逻队的越野车接近的时候，他们就跳到沟里去躲起来，以防被发现。
They threw themselves into ditches whenever the border patrol's SUVs approached.
最后着重讨论边界可能的组合形式，利用刚体极限平衡分析法对杨房沟坝肩抗滑稳定进行评价。
Finally, possible combinations of boundaries and anti-sliding stability of Yangfanggou dam abutment rock mass are evaluated using rigid limit equilibrium analysis method.
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