8 manpower

manpower
n[U]
1 number of people working or available for work 劳动力
    There´s not enough qualified manpower to staff all the hospitals. 缺乏足够的合格人员充实各医院.
    [attrib 作定语]
a manpower shortage 缺乏劳动力.
2 power supplied by human physical effort 人力; 体力
    a treadmill driven by manpower rather than water-power 人力驱动而非水力驱动的踏车.