群山青翠，陡然屹立于宽阔的大河之上。
我站在河岸上，望着外边的大河之上。
桥的出现本是自然之笔——小溪之上的一根原木，或大河之中一堆砾石。
The first bridges were made by nature itself — as simple as a log fallen across a stream or stones in the river.
地利，就是指我方工事修筑在险峻的地势之上，有深川、大河作天然屏障。
The environment advantage refers to surrounding terrains of our structures. Whether there are deep valleys or large rivers that surround our structures.
地利，就是指我方工事修筑在险峻的地势之上，有深川、大河作天然屏障。
The environment advantage refers to surrounding terrains of our structures. Whether there are deep valleys or large rivers that surround our structures.
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