如果你身处热带，这两大气层的分界线——对流层顶离你的头顶约18公里高；如果在高纬度地区(或高山上)则少几公里。
The boundary between the two, the tropopause, is about 18km above your head, if you are in the tropics, and a few kilometres lower if you are at higher latitudes (or up a mountain).
国家的名字来源于波斯尼亚和黑塞哥维那的两个地区，其分界线很模糊。
The country"s name comes from the two regions Bosnia and Herzegovina, which have a very vaguely defined border between them.
马来西亚和印度尼西亚在领海分界线上的纠缠不清则是地区紧张的另一个可靠来源。
Another reliable source of regional tension is the hazy maritime frontier between Malaysia and Indonesia.
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