Here's, how trench warfare works: Two opposing lines of trenches with No-man's land in between.

两条面对面的壕沟，以及夹在中间的。

It was gradually becoming trench warfare anyway; curling (sport? ) seemed more exciting.

无论如何，它正在逐渐变成堑壕战。冰壶（运动？）似乎更令人兴奋。

Instead it dragged on for over four years of bloody trench warfare in northern France and elsewhere.

相反，法国北部和其他地方的血腥堑壕战持续了四年多。

So, when the First World War broke out the result was the trench warfare that lasted longer than anybody had expected.

因此，当第一次世界大战爆发时， 结果是持续时间超过任何人预期的壕沟战。

Yet the stalemate in the war was not broken and two more years of trench warfare in north-eastern France would follow.

然而战争的僵局并未被打破，法国东北部又持续了两年的堑壕战。

Thousands of German troops will be freed up to fight on the Western Front, where the carnage of trench warfare has already claimed more than a million lives.

数千支德军部队届时得以释放调往西部战场，而腥风血雨的沟壕战争已索远超100万人的性命。

Twelve years earlier he had grown to hate the perils of trench warfare in France, and had several times avoided death by declining to attempt valorous impossibilities.

十二年前，他开始痛恨在法国进行的壕沟战的危险， 并多次拒绝尝试勇敢的不可能的事情， 从而避免了死亡。

After the first American contingent arrived at the end of June 1917, Pershing and his officers began to implement their training plan, drilling the men behind the lines before gradually introducing them to trench warfare.

1917 年 6 月底， 第一支美国特遣队抵达后， 潘兴和他的军官们开始实施他们的训练计划，在后方对士兵进行训练， 然后逐渐让他们参加堑壕战。