他们人力不够。
The foremost probably was the sheer need for military manpower that made it attractive to recruit bands of Germanic peoples for the armies.最重要的可能是对军事人力的绝对需求,这使得招募日耳曼人加入军队变得很有吸引力。
The document is a powerful reminder of the manpower on which European mountaineering expeditions depended, and also of the importance of local knowledge and assistance.这份文件有效地佐证了当年欧洲登山探险队依赖的人力资源,也提醒我们了解当地知识和援助途径的重要性。