?outpost ?advance guard 在月球上建立一個(gè)～，作為在火星上登陸之用的中間整備區(qū)域establish a lunar outpost to serve as a staging area for a Martian landing/社會(huì)主義的～outpost of socialism/雙方的～advance guards of the two sides/外交工作的～ outpost of diplomacy/與敵人～接觸skirmish with the enemy’s advance guards/～戰(zhàn)skirmish