1. There is a stone erecting on the boundary between the two countries.
    在两国的交界上, 立着一块石碑。

2. The river which forms the eastern boundary of our farm has always played an important part in our lives.
    形成我们农场东部边界的一条河流一直在我们生活中发挥着重要作用。

3. Police are wary of itinerants who cannot be traced to a recognized camp boundary or to four walls.
    警察当局对行踪漂忽的旅游者十分注意，因为难以查出这些人公认的营地或者居所。

4. Police are wary of itinerants who cannot be traced to a recognized camp boundary or to four walls.
    警察则对那些查不出有固定营地或住处的游荡者保持警惕。