So necessary are the visits of bees to many papilionaceous flowers, that their fertility is greatly diminished if these visits be prevented.

蜜蜂对许多蝶形花的如此必要， 如果阻止这些， 它们的生育能力会大大降低。

Many flowers, on the other hand, have their organs of fructification closely enclosed, as in the great papilionaceous or pea-family; but these almost invariably present beautiful and curious adaptations in relation to the visits of insects.

另一方面，许多花的果实密封闭， 如蝶形花科或豌豆科；但这些几乎总呈现出与昆虫来有关的美丽而奇特的适应。