这迫使我们留在后方。
Read the letters and poems of the heroes at home.读读这些留在后方的英雄写的信笺和诗。
The soldiers were ordered to retreat to safer positions behind the lines.士兵们奉命撤退到后方较为安全的阵地上去.
They infiltrated behind the lines so as to annoy the emery replacements.他们渗透敌后以便骚扰敌军的调度.