你有没有想过骑单车跨越国境到国外旅游呢？
Have you ever thought about bicycling across a foreign country?
这项频繁的活动既发生在境内，也有跨越国境的。
This constant movement happens both inside and outside national frontiers.
他们害怕一旦叙利亚爆发内战，那么汹涌的难民将会跨越国境涌入他们自己的国度。
They rightly fear the huge influx of refugees that would pour across their borders if their neighbour collapses into civil war.
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