Although not technically reforestation, agroforestry (a system of land use in which harvestable trees or shrubs are grown among or around crops or on pasture land, as a means of preserving or enhancing the productivity of the land) provides an opportunity for small-holder farmers to sustain their livelihoods while adding some forest cover to their farms.
尽管严格来说并不属于重新造林,但农林复合经营(即在农作物之间、周围,或牧场上种植可采收的树木或灌木,以保持或提高土地生产力的一种土地利用方式)为小农户提供了维持生计的机会,同时还能增加其农场的森林覆盖。
括号中的名词短语 "a system of land use..." 对主语 "agroforestry" 作同位语说明,补充解释其含义;去掉括号内容后,主干 "agroforestry provides an opportunity..." 仍然完整。因此它属于被括号标示的插入性说明成分。其内部还含有 "in which" 定语从句和 "as a means of..." 介词短语,但本条定位的是整个括号插入语。