boundary|boundaries

这样的暴力行为超出了文明行为的界限。

Such violence is beyond the ___boundaries of civilized conduct.

激情没有界限。

Passion knows no ___boundaries.

这条河形成了两国之间的边界。

The river forms the ___boundary between the two countries.

这条山脉构成了两个地区之间天然的边界。

The mountain range forms a natural ___boundary between the two regions.

无护照跨越国界是违法的。

Crossing the national ___boundary without a passport is illegal.

篱笆标示出了我地产的准确边界。

The fence marks the exact ___boundary of my property.