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1·They usually operated in bands between ten and twenty strong and relied for survival on difficult terrain and bad transport.

他们通常以10到20人的队伍作战，很坚强，依靠艰难的地形和糟糕的交通条件生存下来。

2·Asia, with its multiplicity of cultures and customs, is a particularly difficult terrain.

亚洲有着多样的文化和习俗，是一个特别复杂的地区。

3·You ignore difficult terrain.

你忽视困难地形。

4·In this difficult terrain there isn't enough land to go around.

这里地形险恶，土地稀少。

5·On difficult terrain, the rule is front to back, ten paces;

在险阻地形上作战时，后相距十步。

6·The Dangers: Falling trees, cutting equipment, difficult terrain.

危险处：折断的树，切割设备，险峻的地形。

7·By choosing Charlotte, Mr Obama has taken the fight to difficult terrain.

而通过选择夏洛特，奥巴马先生把战场带到了艰难地带。

8·You might start on the flats and work up to more demanding and difficult terrain.

你可以先在平路上练习，再慢慢挑战要求更高、难度更大的路面。

9·It's a 4-legged robot that can navigate difficult terrain and correct its balance when shoved.

这是一只四足机器人，可浏览复杂地形并在其推进时调整平衡。

10·A horse added to a team of horses to assist a wagon through high water or over difficult terrain.

马车之后的额外的马加入一小组马的一匹马，帮助四轮运货马车通过深水或越过困难地形。