The river marks the boundary.
这条河标志着边界。
They crossed the national boundary.
他们越过了国家边界。
The fence is the property boundary.
这篱笆是财产边界。
Respect the personal boundary.
尊重个人边界。
The map shows the city boundary.
地图显示了城市边界。
Don't cross the boundary.
不要越过边界。
The wall forms the boundary.
墙形成了边界。
Stay within the boundary.
保持在边界内。
The river is a natural boundary.
这条河是自然边界。
They disputed the boundary.
他们对边界有争议。
set boundary
设置边界
boundary value
边界值；极限值；初始值
boundary layer
边界层；附面层
boundary condition
边界条件；极限条件；初始条件
K-T boundary
白垩纪－ 第三纪边界；CRETACEOUS-TERTIARY BOUNDARY的简称
复数: boundaries;
