The area was full of streams and bogs and other natural obstacles.

此地遍布小溪、泥潭和其他天然障碍。

《牛津词典》

The natural obstacles that affect flight safety on air route shall be marked on aeronautical charts;

第八十五条航路上影响飞行安全的自然障碍物体，应当在航图上标明；

youdao

The pathway among the woods seemed Wilder, more uncouth with its rude natural obstacles and less trodden by the foot of man than he remembered it on his outward journey.

那林间小路在他看来，比他记忆中来时的途径，似是更加蛮荒，由于天然的高低不平面更加坎坷，而且更少有人迹了。

youdao

Most involve reducing obstacles to the natural tendency of information to spread freely and evolve through collaboration.

FORBES: What Makes an Idea a Meme?

"Call of Duty: Ghosts" adds dynamic maps, including natural events such as floods and earthquakes and player-activated obstacles such as doors and explosive traps.

CNN: New Xbox and PS4 -- meet 'Call of Duty: Ghosts'

Devon County Council and Natural England have been keen to undertake work but there have been various obstacles, including landowner opposition and potential costs of compensation.

BBC: Two steps forward, one back