Late in life , gatling did divert his attention to steam-powered ploughs .

加特林到了晚年，他确实将注意力转移到了蒸汽式的犁。

Historically , women were much more involved in farming among groups that did not use ploughs .

历史上，女人在种群中更多地参加到没有使用犁的农业中。

Broadly speaking , ploughs are most useful for crops that require large tracts of land to be tilled in a short span of time , perhaps because the climate favours a grain with a relatively short growing season .

更广泛地来说，或许因为气候更青睐于生长季节相对较短的谷物，一些谷物要求在一定时间内大范围地种植，对于它们而言，犁是最有效的工具。