boundary

National boundaries are becoming increasingly meaningless in the global economy.

在全球经济中，国界已经变得越来越没有意义。

We would need their agreement to build outside the city boundary .

我们在市界以外的地方建房需要他们批准。

The stream curves round to mark the boundary of his property.

小河打了个弯，为他这块地划出了边界。

Anything that crosses the boundary of a black hole cannot get back.

任何物质只要跨越黑洞的界线就再也无法出来。

We walked through the churchyard towards the boundary wall .

我们穿过教堂墓地，向院墙走去。

The property’s boundary line is 25 feet from the back of the house.

这块地产的边界线在屋后25英尺的地方。

boundary disputes between neighbouring countries

邻国之间的边界争端

the boundaries of human knowledge

人类知识的极限