Defining and policing a hard boundary will be impossible.

界定和执行一条硬性的界线将是不可能的。

youdao

If you hit it really hard and a long way, it goes over the boundary.

如果你真的击得很重，打得很远，它就会过界。

youdao

If you follow the boundary between two colors, you'll notice that some lines appear to be very hard and rigid, while other lines are soft and fuzzy.

如果你细看两种颜色间的边界，你就会注意到有些线似乎非常刚硬而刻板，而另一些线则柔软而模糊。

youdao

And if you hit it really hard and a long way, it goes over the boundary.

还有就是，如果你真的击得很重，打得很远，过界了。

板球的规则 - SpeakingMax英语口语达人

But former Lib Dem leader Sir Menzies Campbell described the coalition as a "marriage of inconvenience" and said there would be "a lot of hard talking" on the issue of Commons boundary reforms - thought likely to benefit the Conservatives - should plans to overhaul the Lords collapse.

BBC: UK Politics