maintaining和maintainance做名词时区别？

maintaining和maintainance做名词时区别？

maintaining做动名词主语，而maintainance则直接做主语。就是用动名词形式（即ing）做句子的主语(后面需要接其他词,如名词或名词短语,整个做主语)，例如maintaining an adequate food suply is of great significance to social stability. 和 In the future the machines will need spare parts and maintenance.或者说 maintenance强调状态，而maintaining强调动作。望采纳。。。谢谢！